js正则表达式的分组和反向引用

 javascript的正则反引用是通过RegExp.$1，RegExp.$2反向引用的。

 

例子：

var reg = /(/w+)~(/w+)/;var textt="dddd~123";if(reg.test(textt)){ console.log(RegExp.$1); console.log(RegExp.$2);}/*如果没有值，会是undefined的*//*通过反向引用创建对象*/var reg = /(/w+)~(/w+)/;var lines = txt.split("/r/n"); var field = "devno~haha";var chaxs = "~";var fields = field.split(chaxs); var array = new Array(); for(var i=0;i<lines.length;i++){ console.log(lines[i]); reg.test(lines[i]); var obj ={}; for(var j=0;j<fields.length;j++){ if(RegExp["$"+(j+1)]){ obj[fields[j]] = RegExp["$"+(j+1)]; } } array.push(obj); } for(i=0;i<array.length;i++){ var obj = array[i]; var tt = ""; for(var prop in obj){ tt+=prop+":"+obj[prop]+","; } console.log(tt);};