请教正则有办法replace指定个数吗

[renzaijiang]

如果设置全局参数就是全部 否则是一个 如何是指定数目

[wcwtitxu]

// 修改 String.prototype.replace
(function () {
	var method = String.prototype.replace
	String.prototype.replace = function(regex, evaluator, frequency) {
		if (!(frequency > 0)) return method.apply(this, arguments);
		var count = 0;
		return method.call(this, regex, function() {
			return (count++ >= frequency) ? arguments[0] :
				(evaluator instanceof Function) ? evaluator.apply(null, arguments) : evaluator;
		});
	};
})();


var s = "aaaaaaa";

WScript.Echo(	s.replace(/a/g, "A")    );
WScript.Echo(	s.replace(/a/g, "A", 2) );

var i = 0;
WScript.Echo(	s.replace(/a/g, function(){return ++i;})    );
    i = 0;
WScript.Echo(	s.replace(/a/g, function(){return ++i;}, 3) );

[sohighthesky]

String.prototype.replaceCount=function(reg,rep,count) {
    var i=0,str=String(this);
    while(str!=(str=str.replace(reg,rep)) && (++i<count));
    return str;
};
var str="heillo ,this is my is dd hh is3 not my is  is";
str=str.replaceCount(/(is)/,function($,$1) {
    return String($1).toUpperCase();
},3)
alert(str);

[真哥哥]

指定个数没试过，你可以把要replace的元素截取出来嘛！

[dh20156]

可以在replace函数里自己限制，如：

<script type="text/javascript">
/* 替换两次ha为wa */
var s = 'hahahaha';
var l = 0;
var s2 = s.replace(/(ha)/ig,function(a,b){if(b&&l<2){l++;return 'Wa';}else{return b;}});
alert(s2);
</script>

[antony1029]

[Quote=引用 4 楼 wcwtitxu 的回复:]
JScript code// 修改 String.prototype.replace(function () {var method= String.prototype.replace
String.prototype.replace=function(regex, evaluator, frequency) {if (!(frequency>0))return method.apply(?-
[/Quote]
顶！！！

[renzaijiang]