最近在做项目，用到了正则表达式，以前没有咋用过，所以不太熟，不说废话，直接说例子，一段文字：fasjfdhasljfhasldfhalkfdhas javascript akjdfkafhjsak;fa http https sfja;skldfjas;dfjaskdjakjdas
第一种方法：
数据文件：
module.exports = {
"labels": {
"JavaScript": [ "JavaScript",/ES ?6/ ],
"HTTP": [ /http[^:]/],
"HTML": [ "HTML","HTML5" ],
}
};
写匹配正则函数：

function label(article) {
    var htmltext = article;
    var labels = [];
    for (var prop in objlabels) {
        var count = 0;
        var arrlabel = objlabels[prop];
        var len = arrlabel.length;
        for (var i = 0; i < len; i++) {
            if(typeof(arrlabel[i]) != "string") {
                pattern = arrlabel[i].source;
                pattern = new RegExp(pattern,'gi');
                console.log("处理过的pattern = " + pattern);
                console.log("处理过的pattern类型" + typeof(pattern));
            } else {
                var pattern = new RegExp(arrlabel[i],'gi');
                console.log("正常pattern = " + pattern);
                console.log("正常的pattern类型" + typeof(pattern));
            }
            var ret = htmltext.match(pattern);
            if (ret) {
                console.log("reg = "+ret);
                count += ret.length;
                }
            }
        }
    }
}

第二种方法：
数据文件：
module.exports = {
"labels": {
"JavaScript": [ "JavaScript","ES ?6"],
"HTTP": ["http[^:]"],
}
};
匹配正则函数：

function label(article) {
    var htmltext = article;
    var labels = [];
    for (var prop in objlabels) {
        var count = 0;
        var arrlabel = objlabels[prop];
        var len = arrlabel.length;
        for (var i = 0; i < len; i++) {
            var pattern = new RegExp(arrlabel[i],'gi');
            console.log("pattern = " + pattern);
            console.log("pattern类型" + typeof(pattern));
            var ret = htmltext.match(pattern);
            if (ret) {
                count += ret.length;
            }
        }
    }
}

var pattern = RegExp(“http”,’gi’);
这个pattern是一个正则对象，所以第二种方法会比较好用，因为没有类型的转换，不用分析两种情况。

请多多鼓励^_^