hisener/url-shortener

exports.test = function (url) {
  var re = /[(http(s)?):\/\/(www\.)?a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/

  if (re.test(url)) return true

  return false
}

exports.nextString = function (str) {
  var length = str.length
  var c = str.charAt(length - 1)

  if (c === 'z') {
    return (length > 1) ? this.nextString(str.substr(0, length - 1)) + 'a' : 'aa'
  }

  return str.substr(0, length - 1) + String.fromCharCode(c.charCodeAt(0) + 1)
}