regex-weburl.rb

#
# Regular Expression for URL validation
#
# Converted Diego Perini's regexp to ruby
#
# Author: James Robey
# Updated: 2013/02/07
#
# Credits to Matt (mparodi)
# 
#
# the regular expression composed & commented
# could be easily tweaked for RFC compliance,
# it was expressly modified to fit & satisfy
# these test for an URL shortener:
#
#   http://mathiasbynens.be/demo/url-regex
#
# Notes on possible differences from a standard/generic validation:
#
# - utf-8 char class take in consideration the full Unicode range
# - TLDs have been made mandatory so single names like "localhost" fails
# - protocols have been restricted to ftp, http and https only as requested
#
# Changes:
#
# - IP address dotted notation validation, range: 1.0.0.0 - 223.255.255.255
#   first and last IP address of each class is considered invalid
#   (since they are broadcast/network addresses)
#
# - Added exclusion of private, reserved and/or local networks ranges
#
# Compressed one-line versions:
#
# Javascript version
#
# /^(?:(?:https?|ftp):\/\/)(?:\S+(?::\S*)?@)?(?:(?!10(?:\.\d{1,3}){3})(?!127(?:\.\d{1,3}){3})(?!169\.254(?:\.\d{1,3}){2})(?!192\.168(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))(?::\d{2,5})?(?:\/[^\s]*)?$/i
#
# PHP version
#
# _^(?:(?:https?|ftp)://)(?:\S+(?::\S*)?@)?(?:(?!10(?:\.\d{1,3}){3})(?!127(?:\.\d{1,3}){3})(?!169\.254(?:\.\d{1,3}){2})(?!192\.168(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)(?:\.(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)*(?:\.(?:[a-z\x{00a1}-\x{ffff}]{2,})))(?::\d{2,5})?(?:/[^\s]*)?$_iuS
#

module URL
  Regexp = begin
   # protocol identifier
   protocol_identifier = "(?:(?:https?|ftp)://)" 
   # user:pass authentication
   user_pass_auth = "(?:\\S+(?::\\S*)?@)?" 
   # IP address exclusion
   # private & local networks
   ip_address_exclusion = "(?!10(?:\\.\\d{1,3}){3})" + "(?!127(?:\\.\\d{1,3}){3})" + "(?!169\\.254(?:\\.\\d{1,3}){2})" + "(?!192\\.168(?:\\.\\d{1,3}){2})" + "(?!172\\.(?:1[6-9]|2\\d|3[0-1])(?:\\.\\d{1,3}){2})" 
   # IP address dotted notation octets
   # excludes loopback network 0.0.0.0
   # excludes reserved space >= 224.0.0.0
   # excludes network & broacast addresses
   # (first & last IP address of each class)
   ip_address_exclusion2 = "(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])" + "(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}" + "(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))" 
   host_name =  "(?:(?:[a-z\\u00a1-\\uffff0-9]+-?)*[a-z\\u00a1-\\uffff0-9]+)" 
   domain_name =   "(?:\\.(?:[a-z\\u00a1-\\uffff0-9]+-?)*[a-z\\u00a1-\\uffff0-9]+)*" 
   tld =  "(?:\\.(?:[a-z\\u00a1-\\uffff]{2,}))" 
   port_number = "(?::\\d{2,5})?" 
   resource_path = "(?:/[^\\s]*)?" 
   pattern = /\A#{protocol_identifier + user_pass_auth + "(?:" + ip_address_exclusion + ip_address_exclusion2 + "|" + host_name + domain_name + tld + ")" + port_number + resource_path}\z/i
  end
end