gistfile1.js

/**
 * Trim sting to the part between prefix and suffix
 */
String.prototype.between = function(prefix, suffix) {
  var string = this;
  var i = string.indexOf(prefix);
  if (i >= 0) {
    string = string.substring(i + prefix.length);
  }
  else {
    return '';
  }
  if (suffix) {
    i = string.indexOf(suffix);
    if (i >= 0) {
      string = string.substring(0, i);
    }
    else {
      return '';
    }
  }
  return string;
}