C#用正则表达式验证格式:电话号码、密码、邮编、手机号码、身份证、指定的小数点后位数、有效月、有效日

正则表达式在程序设计中有着重要的位置,经常被用于处理字符串信息。

用Regex类的IsMatch方法,使用正则表达式可以验证电话号码是否合法。

一、涉及到的知识点

Regex类的IsMatch方法用于指示正则表达式使用pattern参数中指定的正则表达式是否在输入字符串中找到匹配项。语法格式如下:

cs 复制代码
public static bool IsMatch(string input,string patterm)

参数说明
Input:字符串对象,表示要搜索匹配项的字符串。
Pattern:字符串对象,表示要匹配的正则表达式模式。
Bool:返回布尔值,如果正则表达式找到匹配项,则返回值为true,否则返回值为false。

其中,正则表达式中匹配位置的元字符"^"。正则表达式中"^"用于匹配行首,如果正则表达式匹配以First开头的行,则正则表达式如下:^First。

如果电话号码的格式:xxx-xxxxxxxx,其中,x---代表数字,那么匹配的正则表达式是:^(\d{3,4}-)?\d{6,8}$。

如果密码有a-z、A-Z、0-9组成,并且至少一个大小写字母数字,那么其正则表达式:[A-Za-z]+[0-9];

如果密码有a-z、A-Z、0-9组成,并且至少一个大小写字母数字,那么其正则表达式:[A-Za-z0-9]+,其中+有没有都可以;

如果把正则表达式改为[A-Z]+[a-z]+[0-9],就变成依次至少一个大写、一个小写、一个数字了,打乱了顺序都不行。

由6位数字组成的邮编的正则表达式:^\d{6}$;

手机号码由11位数字组成,以1开头、第二位数字为3,4,5,6,7,8,9中一个、第三位到十一位数字为0到9的任意一个数字,其正则表达式:^1[3-9]\d{9}$;

18位身份号码是特征组合码,由十七位数字本体码和一位校验码组成。排列顺序从左至右依次为:六位数字地址码,八位数字出生日期码,三位数字顺序码和一位校验码。其中:

  • 地址码:表示编码对象常住户口所在县(市、旗、区)的行政区划代码,按GB/T2260的规定执行。其中前两位为省份编码。
  • 出生日期码:表示编码对象出生的年、月、日,按GB/T7408的规定执行,格式如20240130,之间不用分隔符。
  • 顺序码:表示在同一地址码所标识的区域范围内,对同年、同月、同日出生的人编定的顺序号,顺序码的奇数分配给男性,偶数分配给女性。
  • 校验码计算方式:

(1)对前17位数字本体码加权求和公式为:S = Sum(Ai * Wi), i = 1, ... , 17。其中Ai表示第i位置上的身份证号码数值;Wi表示第i位置上的加权因子,按位置依次为:7 9 10 5 8 4 2 1 6 3 7 9 10 5 8 4 2;

(2)以11对计算结果取模:Y = mod(S, 11);

(3)根据模的值得到对应的校验码,对应关系为:

Y值:0 1 2 3 4 5 6 7 8 9 10

校验码:1 0 X 9 8 7 6 5 4 3 2

身份证号正则表达式:

cs 复制代码
//闰年
^[1-9]\d{5}(19|20)\d{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2]\d|3[0-1])|(04|06|09|11)(0[1-9]|[1-2]\d|30)|02(0[1-9]|[1-2]\d))\d{3}[\dXx]$
//平年
^[1-9]\d{5}(19|20)\d{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2]\d|3[0-1])|(04|06|09|11)(0[1-9]|[1-2]\d|30)|02(0[1-9]|1\d|2[0-8]))\d{3}[\dXx]$

用正则表达式可以校验指定小数点后的位数是否匹配,比如验证小数点后位数是否2位的正则表达式:^[0-9]+(.\d{2})?,\^\[0-9\]+.\\d{2},^[0-9]+\.\d{2},\^\[0-9\]+\\.\[0-9\]{2}

验证输入的数值是否有效的月份的正则表达式:^(0?[[1-9]1[0-2]]$,其中0?表示匹配零个或1个"0",[1-9]表示匹配数字1~9,1[0-2]表示匹配数字10、11、12。

验证输入的日期型字符串是否符合日期,需要判断是否是小月、大月、二月闰年、二月平年,因此需要用4个正则表达式才能正确表达任意的输入是否符合日期的规则;完整的正则表达式:小月"^((0?[1-9])|((1|2)[0-9])|30)",大月"\^((0?\[1-9\])\|((1\|2)\[0-9\])\|30\|31)",润二月"^((0?[1-9])|((1|2)[0-9]))",平二月"\^((0?\[1-9\])\|((1\|2)\[0-8\]))"。

如果用DateTime.ParseExact方法验证输入的日期格式,不需要复杂的判断,简简单单就可以实现设计目的。

二、实例1:验证电话号码的格式

cs 复制代码
//使用正则表达式验证电话号码
namespace _070
{
    public partial class Form1 : Form
    {
        private Label? label1;
        private Label? label2;
        private Label? label3;
        private Button? button1;
        private TextBox? textBox1;
        public Form1()
        {
            InitializeComponent();
            Load += Form1_Load;
        }
        private void Form1_Load(object? sender, EventArgs e)
        {
            // 
            // label1
            // 
            label1 = new Label
            {
                AutoSize = true,
                Location = new Point(36, 22),
                Name = "label1",
                Size = new Size(68, 17),
                TabIndex = 0,
                Text = "输入号码:"
            };
            // 
            // label2
            //        
            label2 = new Label
            {
                AutoSize = true,
                Location = new Point(156, 49),
                Name = "label2",
                Size = new Size(79, 17),
                TabIndex = 1,
                Text = "xxx-xxxxxxxx"
            };
            // 
            // label3
            //          
            label3 = new Label
            {
                AutoSize = true,
                Location = new Point(36, 49),
                Name = "label3",
                Size = new Size(68, 17),
                TabIndex = 2,
                Text = "号码格式:"
            };
            // 
            // button1
            //         
            button1 = new Button
            {
                Location = new Point(160, 76),
                Name = "button1",
                Size = new Size(75, 23),
                TabIndex = 3,
                Text = "号码验证",
                UseVisualStyleBackColor = true
            };
            button1.Click += Button1_Click;
            // 
            // textBox1
            // 
            textBox1 = new TextBox
            {
                Location = new Point(115, 16),
                Name = "textBox1",
                Size = new Size(120, 23),
                TabIndex = 4
            };
            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(294, 111);
            Controls.Add(textBox1);
            Controls.Add(button1);
            Controls.Add(label3);
            Controls.Add(label2);
            Controls.Add(label1);
            Name = "Form1";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "使用正则表达式验证电话号码";
          
        }
        /// <summary>
        /// 验证电话号码格式是否正确
        /// </summary>
        private void Button1_Click(object? sender, EventArgs e)
        {
            if (!IsTelephone(textBox1!.Text))
            { 
                MessageBox.Show("电话号码格式不正确"); 
            }
            else 
            { 
                MessageBox.Show("电话号码格式正确"); 
            }
        }

        /// <summary>
        /// 验证电话号码格式是否匹配
        /// </summary>
        /// <param name="str_telephone">电话号码信息</param>
        /// <returns>方法返回布尔值</returns>
        public static bool IsTelephone(string str_telephone)
        {
            return MyRegex().IsMatch(str_telephone);
        }

        [System.Text.RegularExpressions.GeneratedRegex(@"^(\d{3,4}-)?\d{6,8}$")]
        private static partial System.Text.RegularExpressions.Regex MyRegex();
    }
}

三、实例2:验证密码的格式

cs 复制代码
// 使用正则表达式验证密码格式
namespace _071
{
    public partial class Form1 : Form
    {
        private GroupBox? groupBox1;
        private Button? button1;
        private TextBox? textBox1;
        private Label? label1;

        public Form1()
        {
            InitializeComponent();
            Load += Form1_Load;
        }
        private void Form1_Load(object? sender, EventArgs e)
        {
            // 
            // button1
            // 
            button1 = new Button
            {
                Location = new Point(171, 58),
                Name = "button1",
                Size = new Size(100, 23),
                TabIndex = 2,
                Text = "验证密码格式",
                UseVisualStyleBackColor = true
            };
            button1.Click += Button1_Click;
            // 
            // textBox1
            // 

            textBox1 = new TextBox
            {
                Location = new Point(126, 24),
                Name = "textBox1",
                Size = new Size(145, 23),
                TabIndex = 1
            };
            // 
            // label1
            //

            label1 = new Label
            {
                AutoSize = true,
                Location = new Point(35, 30),
                Name = "label1",
                Size = new Size(68, 17),
                TabIndex = 0,
                Text = "输入密码:"
            };
            // 
            // groupBox1
            // 
            groupBox1 = new GroupBox
            {
                Location = new Point(12, 12),
                Name = "groupBox1",
                Size = new Size(307, 87),
                TabIndex = 0,
                TabStop = false,
                Text = "密码必须由数字和大小写字母组成"
            };
            groupBox1.Controls.Add(button1);
            groupBox1.Controls.Add(textBox1);
            groupBox1.Controls.Add(label1);
            groupBox1.SuspendLayout();

            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(331, 111);
            Controls.Add(groupBox1);
            Name = "Form1";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "正则表达式验证密码格式";
            groupBox1.ResumeLayout(false);
            groupBox1.PerformLayout();
        }

        private void Button1_Click(object? sender, EventArgs e)
        {
            if (!IsPassword(textBox1!.Text.Trim()))
            { 
                MessageBox.Show("密码格式不正确!!!"); 
            }
            else
            {
                MessageBox.Show("密码格式正确!!!!!");
            }
        }
        /// <summary>
        /// 验证码码输入条件
        /// </summary>
        /// <param name="str_password">密码字符串</param>
        /// <returns>返回布尔值</returns>
        public static bool IsPassword(string str_password)
        {
            return MyRegex().IsMatch(str_password);
        }

        [System.Text.RegularExpressions.GeneratedRegex(@"[A-Za-z]+[0-9]")]//至少有一个字母,至少有一个数字
        //[System.Text.RegularExpressions.GeneratedRegex(@"[A-Z]+[a-z]+[0-9]")]//依次至少有一个大写一个小写一个
        //[System.Text.RegularExpressions.GeneratedRegex(@"[A-Za-z0-9]+")]//至少一个
        private static partial System.Text.RegularExpressions.Regex MyRegex();
    }
}

四、实例3:验证邮编的格式

cs 复制代码
// 用正则表达式验证邮编合法性
namespace _072
{
    public partial class Form1 : Form
    {
        private GroupBox? groupBox1;
        private TextBox? textBox1;
        private Button? button1;
        private Label? label1;

        public Form1()
        {
            InitializeComponent();
            Load += Form1_Load;
        }
        private void Form1_Load(object? sender, EventArgs e)
        {
            // 
            // textBox1
            // 
            textBox1 = new TextBox
            {
                Location = new Point(139, 32),
                Name = "textBox1",
                Size = new Size(100, 23),
                TabIndex = 2
            };
            // 
            // button1
            // 
            button1 = new Button
            {
                Location = new Point(139, 61),
                Name = "button1",
                Size = new Size(100, 23),
                TabIndex = 1,
                Text = "验证邮编",
                UseVisualStyleBackColor = true
            };
            button1.Click += Button1_Click;
            // 
            // label1
            // 
            label1 = new Label
            {
                AutoSize = true,
                Location = new Point(55, 35),
                Name = "label1",
                Size = new Size(68, 17),
                TabIndex = 0,
                Text = "输入邮编:"
            };
            // 
            // groupBox1
            // 
            groupBox1 = new GroupBox
            {
                Location = new Point(12, 12),
                Name = "groupBox1",
                Size = new Size(280, 98),
                TabIndex = 0,
                TabStop = false,
                Text = "验证邮编格式:"
            };
            groupBox1.Controls.Add(textBox1);
            groupBox1.Controls.Add(button1);
            groupBox1.Controls.Add(label1);
            groupBox1.SuspendLayout();
            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(304, 122);
            Controls.Add(groupBox1);
            Name = "Form1";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "验证邮编格式合法性";
            groupBox1.ResumeLayout(false);
            groupBox1.PerformLayout();
        }

        private void Button1_Click(object? sender, EventArgs e)
        {
            if (!IsPostalcode(textBox1!.Text))
            { 
                MessageBox.Show("邮政编号不正确!!!"); 
            }
            else 
            {
                MessageBox.Show("邮政编号正确!!!!!"); 
            }
        }
        /// <summary>
        /// 验证邮编格式是否正确
        /// </summary>
        /// <param name="str_postalcode">邮编字符串</param>
        /// <returns>返回布尔值</returns>
        public static bool IsPostalcode(string str_postalcode)
        {
            return MyRegex().IsMatch(str_postalcode);
        }

        [System.Text.RegularExpressions.GeneratedRegex(@"^\d{6}$")]
        private static partial System.Text.RegularExpressions.Regex MyRegex();
    }
}

五、实例4:验证手机号码的格式

cs 复制代码
//用正则表达式验证手机号码合法性
namespace _073
{
    public partial class Form1 : Form
    {
        private GroupBox? groupBox1;
        private Button? button1;
        private TextBox? textBox1;
        private Label? label1;

        public Form1()
        {
            InitializeComponent();
            Load += Form1_Load;
        }
        private void Form1_Load(object? sender, EventArgs e)
        {
            // 
            // button1
            // 
            button1 = new Button
            {
                Location = new Point(129, 60),
                Name = "button1",
                Size = new Size(120, 23),
                TabIndex = 3,
                Text = "验证手机号码",
                UseVisualStyleBackColor = true
            };
            button1.Click += Button1_Click;
            // 
            // textBox1
            // 
            textBox1 = new TextBox
            {
                Location = new Point(129, 31),
                Name = "textBox1",
                Size = new Size(120, 23),
                TabIndex = 1
            };
            // 
            // label1
            //           
            label1 = new Label
            {
                AutoSize = true,
                Location = new Point(31, 37),
                Name = "label1",
                Size = new Size(92, 17),
                TabIndex = 0,
                Text = "输入手机号码:"
            };
            // 
            // groupBox1
            // 
            groupBox1 = new GroupBox
            {
                Location = new Point(12, 12),
                Name = "groupBox1",
                Size = new Size(280, 92),
                TabIndex = 0,
                TabStop = false,
                Text = "验证手机号码"
            };
            groupBox1.Controls.Add(button1);
            groupBox1.Controls.Add(textBox1);
            groupBox1.Controls.Add(label1);
            groupBox1.SuspendLayout();
           
            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(304, 122);
            Controls.Add(groupBox1);
            Name = "Form1";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "验证手机号码合法性";
            groupBox1.ResumeLayout(false);
            groupBox1.PerformLayout();
        }

        private void Button1_Click(object? sender, EventArgs e)
        {
            if (!IsHandset(textBox1!.Text))
            { 
                MessageBox.Show("手机号不正确!!!"); 
            }
            else
            {
                MessageBox.Show("手机号正确!!!!!"); 
            }
        }
        /// <summary>
        /// 验证手机号是否正确
        /// </summary>
        /// <param name="str_handset">手机号码字符串</param>
        /// <returns>返回布尔值</returns>
        public static bool IsHandset(string str_handset)
        {
            return MyRegex().IsMatch(str_handset);
        }

        [System.Text.RegularExpressions.GeneratedRegex(@"^[1]+[3-9]+\d{9}$")]
        private static partial System.Text.RegularExpressions.Regex MyRegex();
    }
}

六、实例5:验证身份证号码的格式

cs 复制代码
// 用正则表达式验证身份证号码合法性
namespace _074
{
    public partial class Form1 : Form
    {
        private GroupBox? groupBox1;
        private Button? button1;
        private TextBox? textBox1;
        private Label? label1;

        public Form1()
        {
            InitializeComponent();
            Load += Form1_Load;
        }
        private void Form1_Load(object? sender, EventArgs e)
        {
            // 
            // label1
            // 
            label1 = new Label
            {
                AutoSize = true,
                Location = new Point(16, 28),
                Name = "label1",
                Size = new Size(104, 17),
                TabIndex = 0,
                Text = "输入身份证号码:"
            };
            // 
            // textBox1
            // 
            textBox1 = new TextBox
            {
                Location = new Point(125, 22),
                Name = "textBox1",
                Size = new Size(140, 23),
                TabIndex = 1
            };
            // 
            // button1
            // 
            button1 = new Button
            {
                Location = new Point(190, 57),
                Name = "button1",
                Size = new Size(75, 23),
                TabIndex = 2,
                Text = "验证",
                UseVisualStyleBackColor = true
            };
            button1.Click += Button1_Click;
            // 
            // groupBox1
            // 
            groupBox1 = new GroupBox
            {
                Location = new Point(12, 12),
                Name = "groupBox1",
                Size = new Size(280, 99),
                TabIndex = 0,
                TabStop = false,
                Text = "验证身份证号码"
            };
            groupBox1.Controls.Add(button1);
            groupBox1.Controls.Add(textBox1);
            groupBox1.Controls.Add(label1);
            groupBox1.SuspendLayout();

            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(304, 123);
            Controls.Add(groupBox1);
            Name = "Form1";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "验证身份证号码合法性";
            groupBox1.ResumeLayout(false);
            groupBox1.PerformLayout();
        }

        private void Button1_Click(object? sender, EventArgs e)
        {
            if (!IsIDcard(textBox1!.Text.Trim()))
            { 
                MessageBox.Show("身份证号不正确!!!");
            }
            else 
            { 
                MessageBox.Show("身份证号正确!!!!!"); 
            }
        }
        /// <summary>
        /// 验证身份证号是否正确
        /// </summary>
        /// <param name="idcard">身份证号字符串</param>
        /// <returns>返回布尔值</returns>
        public static bool IsIDcard(string idcard)
        {
            if (DateTime.IsLeapYear(Convert.ToInt32(idcard.Substring(6, 4))))
            {
                return MyRegex().IsMatch(idcard);
            }
            else
            {
                return MyRegex1().IsMatch(idcard);
            }    
        }

        [System.Text.RegularExpressions.GeneratedRegex(@"(^[1-9]\d{5}(19|20)\d{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2]\d|3[0-1])|(04|06|09|11)(0[1-9]|[1-2]\d|30)|02(0[1-9]|[1-2]\d))\d{3}[\dXx]$)")]
        private static partial System.Text.RegularExpressions.Regex MyRegex();

        [System.Text.RegularExpressions.GeneratedRegex(@"(^[1-9]\d{5}(19|20)\d{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2]\d|3[0-1])|(04|06|09|11)(0[1-9]|[1-2]\d|30)|02(0[1-9]|1\d|2[0-8]))\d{3}[\dXx]$)")]
        private static partial System.Text.RegularExpressions.Regex MyRegex1();
    }
}

七、实例6:验证小数点后位数是否2位

cs 复制代码
// 验证小数点后是否为2位
namespace _075
{
    public partial class Form1 : Form
    {
        private GroupBox? groupBox1;
        private Button? button1;
        private TextBox? textBox1;
        private Label? label1;

        public Form1()
        {
            InitializeComponent();
            Load += Form1_Load;
        }
        private void Form1_Load(object? sender, EventArgs e)
        {
            // 
            // label1
            // 
            label1 = new Label
            {
                AutoSize = true,
                Location = new Point(25, 30),
                Name = "label1",
                Size = new Size(68, 17),
                TabIndex = 0,
                Text = "输入小数:"
            };
            // 
            // textBox1
            // 
            textBox1 = new TextBox
            {
                Location = new Point(121, 24),
                Name = "textBox1",
                Size = new Size(135, 23),
                TabIndex = 1
            };
            // 
            // button1
            // 
            button1 = new Button
            {
                Location = new Point(181, 59),
                Name = "button1",
                Size = new Size(75, 23),
                TabIndex = 2,
                Text = "验证",
                UseVisualStyleBackColor = true
            };
            button1.Click += Button1_Click;
            // 
            // groupBox1
            // 
            groupBox1 = new GroupBox
            {
                Location = new Point(12, 11),
                Name = "groupBox1",
                Size = new Size(280, 100),
                TabIndex = 0,
                TabStop = false,
                Text = "验证小数点后位数"
            };
            groupBox1.Controls.Add(button1);
            groupBox1.Controls.Add(textBox1);
            groupBox1.Controls.Add(label1);
            groupBox1.SuspendLayout();

            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(304, 123);
            Controls.Add(groupBox1);
            Name = "Form1";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "验证小数点后是否2位";
            groupBox1.ResumeLayout(false);
            groupBox1.PerformLayout();
        }

        private void Button1_Click(object? sender, EventArgs e)
        {
            if (!IsDecimal(textBox1!.Text.Trim()))
            { 
                MessageBox.Show("请输入两位小数!!!", "提示"); 
            }
            else
            { 
                MessageBox.Show("输入正确!!!!!", "提示"); 
            }
        }
        /// <summary>
        /// 验证小数是否正确
        /// 等效的正则:@"^[0-9]+\.\d{2}$"
        /// 等效的正则:@"^[0-9]+(.\d{2})$"
        /// 等效的正则:@"^[0-9]+.\d{2}$"
        /// 等效的正则:@"^[0-9]+\.[0-9]{2}$"
        /// </summary>
        /// <param name="str_decimal">小数字符串</param>
        /// <returns>返回布尔值</returns>
        public static bool IsDecimal(string str_decimal)
        {
            return MyRegex().IsMatch(str_decimal);
        }

        [System.Text.RegularExpressions.GeneratedRegex(@"^[0-9]+(.\d{2})?$")]
        private static partial System.Text.RegularExpressions.Regex MyRegex();
    }
}

八、实例7:验证输入的数值是否有效月

cs 复制代码
// 用正则表达式验证输入的数字是否有效月
namespace _076
{
    public partial class Form1 : Form
    {
        private GroupBox? groupBox1;
        private Button? button1;
        private TextBox? textBox1;
        private Label? label1;

        public Form1()
        {
            InitializeComponent();
            Load += Form1_Load;
        }
        private void Form1_Load(object? sender, EventArgs e)
        {
            // 
            // label1
            // 
            label1 = new Label
            {
                AutoSize = true,
                Location = new Point(34, 33),
                Name = "label1",
                Size = new Size(92, 17),
                TabIndex = 0,
                Text = "输入月份数值:"
            };
            // 
            // textBox1
            // 
            textBox1 = new TextBox
            {
                Location = new Point(132, 30),
                Name = "textBox1",
                Size = new Size(100, 23),
                TabIndex = 1
            };
            // 
            // button1
            // 

            button1 = new Button
            {
                Location = new Point(157, 59),
                Name = "button1",
                Size = new Size(75, 23),
                TabIndex = 2,
                Text = "验证",
                UseVisualStyleBackColor = true
            };
            button1.Click += Button1_Click;
            // 
            // groupBox1
            // 
            groupBox1 = new GroupBox
            {
                Location = new Point(12, 11),
                Name = "groupBox1",
                Size = new Size(280, 100),
                TabIndex = 0,
                TabStop = false,
                Text = "验证是否有效的月"
            };
            groupBox1.Controls.Add(button1);
            groupBox1.Controls.Add(textBox1);
            groupBox1.Controls.Add(label1);
            groupBox1.SuspendLayout();

            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(304, 123);
            Controls.Add(groupBox1);
            Name = "Form1";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "验证数字是否有效月";
            groupBox1.ResumeLayout(false);
            groupBox1.PerformLayout();
        }

        private void Button1_Click(object? sender, EventArgs e)
        {
            if (!IsMonth(textBox1!.Text.Trim()))
            {
                MessageBox.Show("输入月份不正确!!!", "提示");
            }
            else
            {
                MessageBox.Show("输入信息正确!!!!!", "提示"); 
            }
        }
        /// <summary>
        /// 验证月份是否正确
        /// </summary>
        /// <param name="str_Month">月份信息字符串</param>
        /// <returns>返回布尔值</returns>
        public static bool IsMonth(string str_Month)
        {
            return MyRegex().IsMatch(str_Month);
        }

        [System.Text.RegularExpressions.GeneratedRegex(@"^(0?[[1-9]|1[0-2])$")]
        private static partial System.Text.RegularExpressions.Regex MyRegex();
    }
}

九、实例8:用两种方法分别验证输入是否有效日期

cs 复制代码
//DateTime.ParseExact方法验证输入的日期格式是否正确
//用正则表达式验证输入的日期格式是否正确
using System.Globalization;

namespace _077
{
    public partial class Form1 : Form
    {
        private GroupBox? groupBox1;
        private Button? button1;
        private Button? button2;
        private static TextBox? textBox1;
        private Label? label1;
        private Label?label2;

        public Form1()
        {
            InitializeComponent();
            Load += Form1_Load;
        }
        private void Form1_Load(object? sender, EventArgs e)
        {
            // 
            // label1
            // 
            label1 = new Label
            {
                AutoSize = true,
                Location = new Point(31, 21),
                Name = "label1",
                Size = new Size(92, 17),
                TabIndex = 0,
                Text = "输入日期数值:"
            };
            // 
            // label2
            // 
            label2 = new Label
            {
                AutoSize = true,
                Location = new Point(31, 38),
                Name = "label2",
                Size = new Size(96, 17),
                TabIndex = 3,
                Text = "(如:20240528)"
            };
            // 
            // textBox1
            // 
            textBox1 = new TextBox
            {
                Location = new Point(147, 15),
                Name = "textBox1",
                Size = new Size(100, 23),
                TabIndex = 1
            };
            // 
            // button1
            // 
            button1 = new Button
            {
                Location = new Point(172, 46),
                Name = "button1",
                Size = new Size(75, 23),
                TabIndex = 2,
                Text = "验证1",
                UseVisualStyleBackColor = true
            };
            button1.Click += Button1_Click;
            // 
            // button2
            // 
            button2 = new Button
            {
                Location = new Point(172, 69),
                Name = "button2",
                Size = new Size(75, 23),
                TabIndex = 4,
                Text = "验证2",
                UseVisualStyleBackColor = true
            };
            button2.Click += Button2_Click;
            // 
            // groupBox1
            // 
            groupBox1 = new GroupBox
            {
                Location = new Point(12, 11),
                Name = "groupBox1",
                Size = new Size(280, 100),
                TabIndex = 0,
                TabStop = false,
                Text = "是否有效日期"
            };
            groupBox1.Controls.Add(button1);
            groupBox1.Controls.Add(button2);
            groupBox1.Controls.Add(textBox1);
            groupBox1.Controls.Add(label1);
            groupBox1.Controls.Add(label2);
            groupBox1.SuspendLayout();
            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(304, 123);
            Controls.Add(groupBox1);
            Name = "Form1";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "验证数值是否有效日期";
            groupBox1.ResumeLayout(false);
            groupBox1.PerformLayout();
        }
        /// <summary>
        /// DateTime.ParseExact方法验证输入的日期格式是否正确
        /// </summary>
        private void Button1_Click(object? sender, EventArgs e)
        {
            string format = "yyyyMMdd";
            CultureInfo provider = CultureInfo.CurrentCulture;
            try
            {
                DateTime result = DateTime.ParseExact(textBox1!.Text.Trim(), format, provider);
                MessageBox.Show("输入的日期格式正确.");
            }
            catch (FormatException)
            {
                MessageBox.Show("输入的日期格式不对.");
            }
        }
        /// <summary>
        /// 用正则表达式验证输入的日期格式是否正确
        /// </summary>
        private void Button2_Click(object? sender, EventArgs e)
        {
            int year = Convert.ToInt32(textBox1!.Text.Substring(0, 4));
            int month = Convert.ToInt32(textBox1!.Text.Substring(4, 2));
            string date = textBox1!.Text.Substring(6, 2);

            if (textBox1!.Text != "")
            {
                if (year <= 9999 && year >= 1800)
                {
                    if(month > 1 || month <= 12)
                    {
                        if (IsDay(year,month,date))
                        {
                            MessageBox.Show("输入天数正确!!!", "提示");
                        }
                        else
                        {
                            MessageBox.Show("输入天数不正确!!!!!", "提示");
                        }
                    }
                    else
                    {
                        MessageBox.Show("输入的月不正确!!!", "提示");
                    }
                }
                else
                {
                    MessageBox.Show("输入的年不正确!!!", "提示");
                }
            }
            else
            {
                MessageBox.Show("输入的日期不能为空!", "提示");
            }  
        }

        /// < summary >
        /// 验证输入的数值是否是有效的日期
        /// 验证顺序:是小月?是大月?是2月?都不是那就是其它了
        /// </ summary >
        /// < param name = "daytime" > 每月的天数 </ param >
        /// < returns > 返回布尔值 </ returns >
        private static bool IsDay(int year, int month, string daytime)
        {
            if (month == 04 || month == 06 || month == 09 || month == 11 || month == 4 || month == 6 || month == 9)
            {
                return MyRegex().IsMatch(daytime); 
            }
            else if (month == 01 || month == 03 || month == 05 || month == 07 || month == 08 || month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
             {
                return MyRegex1().IsMatch(daytime);
             }
            else if (month == 2)
             {
                 if (DateTime.IsLeapYear(year))
                 {
                     return MyRegex2().IsMatch(daytime);
                 }
                 else
                 {
                     return MyRegex3().IsMatch(daytime);
                 }
             }
             else
             {
                 return false;
             }
        }

        [System.Text.RegularExpressions.GeneratedRegex(@"^((0?[1-9])|((1|2)[0-9])|30)$")]
        private static partial System.Text.RegularExpressions.Regex MyRegex();
        [System.Text.RegularExpressions.GeneratedRegex(@"^((0?[1-9])|((1|2)[0-9])|30|31)$")]
        private static partial System.Text.RegularExpressions.Regex MyRegex1();
        [System.Text.RegularExpressions.GeneratedRegex(@"^((0?[1-9])|((1|2)[0-9]))$")]
        private static partial System.Text.RegularExpressions.Regex MyRegex2();
        [System.Text.RegularExpressions.GeneratedRegex(@"^((0?[1-9])|((1|2)[0-8]))$")]
        private static partial System.Text.RegularExpressions.Regex MyRegex3();
    }
}
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