escape-char-set-via-regexp.js

/**
 * Usage:
 *
 * js> "some:string.you?wanna-escape".escapeChars(/[:\.\?-]/g);
 * ==> "some%3Astring%2Eyou%3Fwanna%2Descape"
 *
 * The full power of regexes is in your hands, use it for good!
 *
 * - [email protected]
 * Fri Aug  6 21:26:20 CEST 2010
 *
 */

String.prototype.escapeChars = function (re) {
  return this.replace(re, function(char, i) {
    var n = char.charCodeAt(0), s = '';

    do {
      s = "0123456789ABCDEF"[n&15] + s;
      n = n >> 4;
    } while (n);

    return '%' + s; 
  })
};