<html>
<head>
<title>RegExp</title>
</head>
</body>
<script language="javascript">
var strSrc = "xxa1b01c001yya2b02c002zz";
var re = /a(\d)b(\d{2})c(\d{3})/gi;
var arr,count =0;
while( (arr=re.exec(strSrc)) != null)
{
document.write(arr[0]+"<br>");
}
</script>
</body>
</html>
a1b01c001
a2b02c002
<html>
<head>
<title>RegExp</title>
</head>
</body>
<script language="javascript">
var strSrc = "xxa1b01c001yya2b02c002zz";
var re = /a(\d)b(\d{2})c(\d{3})/gi;
var arr,count =0;
arr=strSrc.match(re);
for(i=0; i<arr.length; i++)
{
document.write(arr[i]+"<br>");
}
</script>
</body>
</html>
a1b01c001
a2b02c002
<html>
<head>
<title>RegExp</title>
</head>
</body>
<script language="javascript">
var strSrc = "a12b34c56";
var re = /(\d)(\d)/gi;
var strDest = strSrc.replace(re,"$2$1");
document.write(strDest);
</script>
</body>
</html>
a21b43c65
<html>
<head>
<title>RegExp</title>
</head>
</body>
<script language="javascript">
var strSrc = "我...我要...学..学编程!";
var strDest = strSrc.replace(/\./g,"","").replace(/(.)\1/g,"$1");
document.write(strDest);
</script>
</body>
</html>
我要学编程!
<html>
<head>
<title>RegExp</title>
</head>
</body>
<script language="javascript">
var strSrc = "win a window";
var strDest = strSrc.replace(/\bwin\b/g,"lose");
document.write(strDest);
</script>
</body>
</html>
lose a window
<html>
<head>
<title>RegExp</title>
</head>
</body>
<script language="javascript">
var strSrc = "first line\n"+
"second line\n"+
"third line";
var strDest = strSrc.replace(/^/mg,"#");
document.write(strDest);
</script>
</body>
</html>
#first line #second line #third line
<html>
<head>
<title>RegExp</title>
</head>
</body>
<script language="javascript">
var reg = /(\w+):\/\/([^/:]+)(?::(\d*))?([^#]*)/;
var arr1 = "http://www.it315.org:8080/index.html".match(reg);
var arr2 = "http://www.it315.org/book/welcome.html#mark1".match(reg);
var str = "协议，主机名，端口号，资源路径\n";
str += arr1[1] + "," + arr1[2] + "," + arr1[3] + "," + arr1[4] + "\n";
str += RegExp.$1 + "," + RegExp.$2 + "," + RegExp.$3 + "," + RegExp.$4 + "\n";
document.write(str);
</script>
</body>
</html>
协议，主机名，端口号，资源路径 http,www.it315.org,8080,/index.html http,/book/welcome.html
原文链接：https://www.f2er.com/regex/362265.html