Javascript动态正则表达式生成

Question

I want to make my alphanumeric regex dynamic in a way that it takes the allowed special characters with it as an argument by the user. Following is my code ... I am getting quotes error here .... any body can tell me how to go about it ?

function aplhanumeric(value,allowed){

///^[a-z0-9_\-]+$/i
alert(allowed);
if(allowed != ''){
    var regex = new RegExp('/^[a-z0-9_\' + allowed + ']+$/i');
    return (value.match(regex));
}else{
    return (alphaNumericRegex.test(value));
}
}

Answer 1

您实际上已经避开了引号，所以您必须避开转义

var regex = new RegExp("^[a-z0-9_\\" + allowed + "]+$", "i");