web.js.String and regular expression operation example tutorial

This article mainly introduces relevant information about web.js. string and regular expression operations. Friends in need can refer to

1.substring

var str='abcdef';
alert(str.substring(2, 5)); //cde不包括结束位置
alert(str.substring(1));//bcdef1

2.split

var str='a*b*cd*ef';
alert(str.split('*'));//分割字符1

3.search

var str='acef'; 
alert(str.search(‘a'));//0查找字符位置 
alert(str.search(‘f'));//3 
 alert(str.search(‘ce'));//1 
 alert(str.search(‘o'));//-1匹配失败则-1

regular

var re=new RegExp('b', 'i'); //i不考虑大小写
//或者var re=/b/i;
var str='abcdef';//将b换成B同样的结果，如果去掉i就不行了
alert(str.search(re));

1.match

var str='asdf 34 656 cvs33';
var re=/\d/g;
alert(str.match(re));//3,4,6,5,6,3,3match 获取匹配的项目1
var str='asdf 34 656 cvs33';
var re=/\d+/g;//全局匹配：g——global,+表示一次或者多次
alert(str.match(re));//34，656，33

2.replace

var str='asdf 34 656 cvs33';
var re=/\d+/g;
var re2=/\d/g;
alert(str.replace(re,'*'));//asdf * * cvs*；
alert(str.replace(re2,'*'));//asdf ** *** cvs**1

Remove sensitive words

var str='河南 一村民 开封 哈哈'
  var re=/河南|开封/g;//去掉敏感词河南或开封
  var re1=/河南|开封/;
  alert(str.replace(re,'*'));
  alert(str.replace(re1,'*'))//没有去掉开封，自己试试结果1

3 .[] Any character, range

[abc]

Example: o[usb]t——obt, ost, out

[a-z ], [0-9]

Example: id[0-9]——id0, id5

[^a](exclude everything except a)

Example: o[^0-9]t——oat, o?t, o t

combination

[a-z0-9A-Z]

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