JS正则的一些运用（获取script代码和trim方法）

/*
 * $extendPrototype 扩展prototype函数
 * @param {Function} constructor
 * @param {Object} prototype
 */
var $extendPrototype = function(constructor,prototype) {
    var c = constructor || function(){},
        p = prototype || {};
    for(var atr in p) {
        c.prototype[atr] = p[atr];
    }
    return c;
}
/*
 * String扩展
 */
var strEx = {
    removeJS : function(){    /*删除Script字符串内容*/
        return this.replace(/<script[^>]*?>([\w\W]*?)<\/script>/ig,'');
    },
    getJS : function(){        /*将Script字符串转换为Script对象,返回Script or false*/
        var js = this.replace(/[\s\S]*?<script[^>]*?>([\w\W]*?)<\/script>[\s\S]*?/g,'$1\r');
        if(js == this){
            return false;
        }else{
            var s = document.createElement('script');
            s.text = js;
            return s;
        }
    },
    trim : function(str){    /*删除首尾相应内容,参数为空则删除空格*/
        var reg;
        if(str){
            str = str.replace(/([\.\+\?\*\\\^\&\[\]\(\)\{\}\$\,])/g,'\\$1');
            reg = new RegExp("^(" + str +")+|(" + str + ")+$","g");/* 特殊字符 (. + ? * \ ^ & [ ] ( ) { } $ ,) */
        }else{
            reg = /^\s+|\s+$/g;
        }
        return this.replace(reg,"");
    }
}
String = $extendPrototype(String,strEx);

/* * $extendPrototype 扩展prototype函数 * @param {Function} constructor * @param {Object} prototype */ var $extendPrototype = function(constructor,prototype) { var c = constructor || function(){}, p = prototype || {}; for(var atr in p) { c.prototype[atr] = p[atr]; } return c; } /* * String扩展 */ var strEx = { removeJS : function(){ /*删除Script字符串内容*/ return this.replace(/<script[^>]*?>([\w\W]*?)<\/script>/ig,''); }, getJS : function(){ /*将Script字符串转换为Script对象,返回Script or false*/ var js = this.replace(/[\s\S]*?<script[^>]*?>([\w\W]*?)<\/script>[\s\S]*?/g,'$1\r'); if(js == this){ return false; }else{ var s = document.createElement('script'); s.text = js; return s; } }, trim : function(str){ /*删除首尾相应内容,参数为空则删除空格*/ var reg; if(str){ str = str.replace(/([\.\+\?\*\\\^\&\[\]\(\)\{\}\$\,])/g,'\\$1'); reg = new RegExp("^(" + str +")+|(" + str + ")+$","g");/* 特殊字符 (. + ? * \ ^ & [ ] ( ) { } $ ,) */ }else{ reg = /^\s+|\s+$/g; } return this.replace(reg,""); } } String = $extendPrototype(String,strEx);