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URL > Valid URL (RFC 3986) (Advanced) Favorite

Source: http://nadeausoftware.com/articles/2008/05/php_tip_how_parse_and_build_urls#Code

Copyright (c) 2008, David R. Nadeau, NadeauSoftware.com
BSD Licensed.
Modified by Michael Crumley (added named match groups)

'/
# allow multiple groups with the same name
(?J)
# protocol user host-ip port path path path querystring fragment
^
#protocol
(?:(?<scheme>[a-zA-Z][a-zA-Z\\d+-.]*):)?
(?|
  #slash-slash
  \\/\\/
  #userinfo
  (?:
     #user
     (?<user>[a-zA-Z\\d\\-._~\\!$&\'()*+,;=%]*)
     #password
     (?::(?<pass>[a-zA-Z\\d\\-._~\\!$&\'()*+,;=:%]*))?
  @)?
  #host-ip
  (?<host>(?:[a-zA-Z\\d-.%]+)|(?:\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})|(?:\\[(?:[a-fA-F\\d.:]+)\\]))?
  #port
  (?::(?<port>\\d*))?
  #slash-path
  (?<path>
      (?:\\/    [a-zA-Z\\d\\-._~\\!$&\'()*+,;=:@%]*   )*
  )

#slash-path
  |(?<user>)(?<pass>)(?<host>)(?<port>)
   (?<path>\\/  [a-zA-Z\\d\\-._~\\!$&\'()*+,;=:@%]+(?:\\/[a-zA-Z\\d\\-._~\\!$&\'()*+,;=:@%]*)*)?

#path
  |(?<user>)(?<pass>)(?<host>)(?<port>)
   (?<path>    [a-zA-Z\\d\\-._~\\!$&\'()*+,;=:@%]+(?:\\/[a-zA-Z\\d\\-._~\\!$&\'()*+,;=:@%]*)*)

)?
#querystring
(?:\\?(?<query>[a-zA-Z\\d\\-._~\\!$&\'()*+,;=:@%\\/?]*))?
#fragment
(?:\\#(?<fragment>[a-zA-Z\\d\\-._~\\!$&\'()*+,;=:@%\\/?]*))?
$
/x'

See Also

URL > Valid URL (RFC 3986)

Sample Matches

Text	Result
`/search?q=regular%20expression` Group #0 `/search?q=regular%20expression` user pass host port path `/search` query `q=regular%20expression`	match
`http://www.google.com/` Group #0 `http://www.google.com/` scheme `http` host `www.google.com` path `/`	match
`http://www.google.com/search?q=regular%20expression` Group #0 `http://www.google.com/search?q=regular%20expression` scheme `http` host `www.google.com` path `/search` query `q=regular%20expression`	match
`www.google.com/` Group #0 `www.google.com/` user pass host port path `www.google.com/`	match

Match Groups

scheme: scheme (http, https, etc.)
user: HTTP auth user
pass: HTTP auth password
host: hostname (a.k.a. domain)
port: port number
path: path
query: querystring
fragment: fragment identifier

Notes

The URL www.example.com/ will match as a relative URL with the path "www.example.com/". This is not a bug! If the base url were http://domain.com/, this would point to http://domain.com/www.example.com/.