8-20 WPS JS宏正则表达式-懒惰匹配

8-20 WPS JS宏 正则表达式 - 懒惰匹配

一、 懒惰匹配

懒惰匹配就是尽可能少地匹配，同时也允许正则表达式剩余的部分继续匹配。

(n,m}? 匹配前项至少n次，但不超过m次，但尽可能少重复

(n)? 匹配前项n或更多次，但尽可能少重复

?? 匹配前项零或一次，等价于{0,1)，但尽可能少重复

+? 匹配前项一或多次，等价于{1,，但尽可能少重复

*? 匹配前项零或多次，等价于{0}，但尽可能少重复

二、基础测试

function test(){

//懒惰匹配与贪婪匹配对比

var s="姓名:陈小小,年龄:28,工号:NED088,号码:17773050505";

var s1="BeiJing:0-1-0,ZIP:100000"

var L1=s.match(/\d{3,5}?/g);

//局部变量：L1= $"088","177","730","505"$ ,类型：Array/object

var T1=s.match(/\d{3,5}/g);

//局部变量：T1= $"088","17773","05050"$ ,类型：Array/object

var L2=s.match(/\d{3,}?/g);

//局部变量：L2= $"088","177","730","505"$ ,类型：Array/object

var T2=s.match(/\d{3,}/g);

//局部变量：T2= $"088","17773050505"$ ,类型：Array/object

var L3=s.match(/\d+?/g);

//局部变量：L3= $"2","8","0","8","8","1","7","7","7","3","0","5","0","5","0","5"$ ,类型：Array/object

var T3=s.match(/\d+/g);

//局部变量：T3= $"28","088","17773050505"$ ,类型：Array/object

var L4=s1.match(/(\d-?)+?/g);

//局部变量：L4= $"0-","1-","0","1","0","0","0","0","0"$ ,类型：Array/object

var T4=s1.match(/(\d-?)+/g);

//局部变量：T4= $"0-1-0","100000"$ ,类型：Array/object

var L5=s1.match(/(\d-?)*?/g);

//局部变量：L5= $"","","","","","","","","","","","","","","","","","","","","","","","",""$ ,类型：Array/object

var T5=s1.match(/(\d-?)*/g);

//局部变量：T5= $"","","","","","","","","0-1-0","","","","","","100000",""$ ,类型：Array/object

//示例重点：

//因.点可匹配所有内容除换行符，因此需要懒惰匹配来约束。

var s2="name:leo, age:18 name:Lili,age:20 name:Adam, age:120"

var L6=s2.match(/name.+?\d+/g)

//局部变量：L6= $"name:leo, age:18","name:Lili,age:20","name:Adam, age:120"$ ,类型：Array/object

var T6=s2.match(/name.+\d+/g)

//局部变量：T6= $"name:leo, age:18 name:Lili,age:20 name:Adam, age:120"$ ,类型：Array/object

}

javascript 复制代码

function test(){
	
	//懒惰匹配与贪婪匹配对比
var s="姓名:陈小小,年龄:28,工号:NED088,号码:17773050505";
var s1="BeiJing:0-1-0,ZIP:100000"

var L1=s.match(/\d{3,5}?/g);
//局部变量：L1=["088","177","730","505"],类型：Array/object
var T1=s.match(/\d{3,5}/g);
//局部变量：T1=["088","17773","05050"],类型：Array/object


var L2=s.match(/\d{3,}?/g);
//局部变量：L2=["088","177","730","505"],类型：Array/object
var T2=s.match(/\d{3,}/g);
//局部变量：T2=["088","17773050505"],类型：Array/object


var L3=s.match(/\d+?/g);
//局部变量：L3=["2","8","0","8","8","1","7","7","7","3","0","5","0","5","0","5"],类型：Array/object
var T3=s.match(/\d+/g);
//局部变量：T3=["28","088","17773050505"],类型：Array/object


var L4=s1.match(/(\d-?)+?/g);
//局部变量：L4=["0-","1-","0","1","0","0","0","0","0"],类型：Array/object
var T4=s1.match(/(\d-?)+/g);
//局部变量：T4=["0-1-0","100000"],类型：Array/object


var L5=s1.match(/(\d-?)*?/g);
//局部变量：L5=["","","","","","","","","","","","","","","","","","","","","","","","",""],类型：Array/object
var T5=s1.match(/(\d-?)*/g);
//局部变量：T5=["","","","","","","","","0-1-0","","","","","","100000",""],类型：Array/object


//示例重点：
//因.点可匹配所有内容除换行符，因此需要懒惰匹配来约束。
var s2="name:leo, age:18 name:Lili,age:20 name:Adam, age:120"

var L6=s2.match(/name.+?\d+/g)
//局部变量：L6=["name:leo, age:18","name:Lili,age:20","name:Adam, age:120"],类型：Array/object
var T6=s2.match(/name.+\d+/g)
//局部变量：T6=["name:leo, age:18 name:Lili,age:20 name:Adam, age:120"],类型：Array/object
}

8-20 WPS JS宏 正则表达式-懒惰匹配

8-20 WPS JS宏正则表达式-懒惰匹配