<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script type="text/javascript">
window.onload = function () {
//注意正则加了g,就对正则属性LastIndex属性更改
var reg = /\d+/g;
var r1 = reg.test(‘12312shfskhdf‘);//false
console.log(r1);
console.log(reg.lastIndex);
var r2 = reg.test(‘sdfssdfsf123123‘);//true;
console.log(r2);
console.log(reg.lastIndex);
console.log("对比一下上下两种写法的区别");
console.log(reg.test(‘12312shfskhdf‘));
console.log(reg.lastIndex);
console.log(reg.test(‘sdfssdfsf123123‘));
console.log(reg.lastIndex);
var reg2 = /(\d)(\d)(\d)/;
var str = "97312shfskhdf";
reg2.test(str);
console.log(RegExp.$1);
console.log(RegExp.$2);
console.log(RegExp.$3);
var reg3 = /\d+/g;
var str3 = "dsf34753094sdfsdf";
var str31 = "dsfsdfsdfsdfsdfs345345345s";
console.log(str3.search(reg3));
console.log(str31.search(reg3));
//分解年月日时分秒
var str4 = ‘2015-7-7 22:59:11‘;
var result = str4.split(/-|[ ]+|:/);//按照减号 空格 冒号 分解
// var result = str4.split(/[ -:]/);//按照减号 空格 冒号 分解[]内必须是连续的
console.log(result);
var oldStr = "";
var str5 = ‘32453453455555555559999997263849‘;
var str6 = str5.replace(/(\d)\1/g, function (s1, s2, i, input) {
//s1整个正则捕获的内容
//s2 第一个分组的内容
//console.log(s1);
//console.log(s2);
var newStr = s2;
if (newStr == oldStr) {
return ‘‘;
} else {
oldStr = s2;
return s2;
}
});//连续重复出现的数字
console.log(str5);
console.log(str6);
}
</script>
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<body>
</body>
</html>
原文：http://www.cnblogs.com/alphafly/p/4628858.html