JavaScript RegExp method to escape a string that will be used in a RegExp object constructor, so the characters aren't interpreted as regex special characters

regex-escape.js

RegExp.quote = (function () {
    "use strict";

    var ret, re;

    re = /([.?*+^$[\]\\(){}|-])/g;
    ret = function (str) {
        return ("" + str).replace(re, "\\$1");
    };

    return ret;
}());