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• #1 by marcus on 2/17/09 - 10:14 AM

  

  what the?
  Looks like alien jibberish, but neat stuff.

• #2 by Dustin Sparks on 2/24/09 - 11:01 PM

  

  I have reason to believe regular expressions IS indeed Alien gibberish. Rumor has it, that it apparently can read by a small group of Russian monkeys. Though this is yet to be proven.

• #3 by Almo on 2/28/09 - 11:46 PM

  

  Once there was a programmer with a problem. He said to himself, "I could solve this using regular expressions."
  
  Now he had two problems.
  
  :)

• #4 by James on 4/9/09 - 11:50 AM

  

  I gave it a try. It accepts these:-
  
  
  http://www.google
  
  http://w.google
  
  http://1.g
  
  http://wwwwwwwwwwwwwwwwwwwwwww.google

• #5 by Sylwester on 9/1/09 - 11:30 AM

  

  I guess you don't need RegExp to compare 2 strings.
  
  var pattern:String = "http://www.google.com";;
  
  if(string == pattern) {
  trace('true');
  } else {
  trace('false')
  }

• #6 by egfx on 10/4/09 - 1:59 AM

  

  Lol, Almo. So true.

• #7 by Olivier on 10/7/09 - 8:38 PM

  

  Could be useful, but sadly it doesn't validate urls like :
  http://www.google.com/?a=b
  but hopefully :
  http://www.google.com/c?a=b
  is OK.
  
  If I knew regex well enough, I would have tried to fix it, but it's not the case.

• #8 by Olivier on 10/7/09 - 10:20 PM

  

  Well this one is doing the trick :
  
  var regex:RegExp = /^http(s)?:\/\/((\d+\.\d+\.\d+\.\d+)|(([\w-]+\.)+([a-z,A-Z][\w-]*)))(:[1-9][0-9]*)?(\/([\w-.\/\?:%+@&=]+[\w- .\/\?:%+@&=]*)?)?(#(.*))?$/i;
  
  I've added a "\?" in front of ":%+@&=" then I guess I've corrected a bug but I'm not sure, I've added a "\" in front of "?:%+@&=", because the question mark should be escaped, no ?
  If my "\" isn't correct, it probably should also be remove in my first correction...
  
  I tested it with a few urls and it worked well for me.

• #9 by Olivier on 10/7/09 - 10:23 PM

  

  It's still me here...
  shouldn't the "+" be escaped too ?

• #10 by Olivier on 10/7/09 - 10:38 PM

  

  I'm sorry for spamming the website... Anyway, I hope it's useful for everybody.
  I also hope someone will correct me if I'm making mistakes.
  
  The IP address part should be corrected with : "(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})"
  I will allow IP from 0.0.0.0 up to 999.999.999.999... (which isn't valid but it's still better than 9999999.9999.99999999.99)
  
  And about the port part, ports can be up to 65535, not infinity, so this one is better : "(:[1-9][0-9]{0,4})", but it will allow ports from "1" up to "99999". I've no idea how to add better restrictions.

• #11 by Olivier on 10/8/09 - 1:04 AM

  

  I'm back :)
  
  From : http://www.ietf.org/rfc/rfc1738.txt some valid characters are still missing, so I've added to the regex : "'\(\)$,\*!"
  
  The complete regex looks like this now :
  var regex:RegExp = /^http(s)?:\/\/((\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})|(([\w-]+\.)+([a-z,A-Z][\w-]*)))(:[1-9][0-9]{0,4})?(\/([\w-.\/\?:%\+@&=]+[\w- .\/\?:%\+@&='\(\)$,\*!]*)?)?(#(.*))?$/i;
  
  I still hope somebody will be able to tell us if it's correct or if I'm posting stupidities :-/
  Remember : I'm quite new to regex, so I'm not sure everything I write is OK. From my test it's OK, but we never know.

• #12 by ASM on 12/30/09 - 6:30 PM

  

  Well, thanks guys very much for the good tips. nice work
  
  I have a couble of comments though:
  
  1. These expressions will not accept http://test/file or http://test because there is no extension while I should be able to pass it, hence it will not accept http://localhost
  
  2. the http:// should be optional because i may need to pass relative paths
  
  3. It doesn't either accept ftp://test.com, I assume this is because the http part.
  
  4. This also does not accept e-mail addresses while it should because e-mail address is also a url, right? actually it should accept http://tes@t.com

• #13 by ASM on 12/30/09 - 6:42 PM

  

  I think this can never be done by regular expressions alone. It might be better to devide the url to parts then work on each one depending on its position. For example, [http://, ftp://, gopher://, mailto: etc ...] and [name, name.extension, username@name.extension] then each part[name, name.extension]

• #14 by Stefan Richter on 12/30/09 - 8:35 PM

  

  to clarify, I originally needed a Regex to validate URLs for websites, but not include relative urls. I'm also not interested in FTP addresses or other protocols outside http and https. Basically I needed to verify if someone entered a syntactically valid website address that I could (at least theoretically) reach when typed into my browser. Maybe it's worth to try again with some of the above suggestions.

• #15 by ASM? on 1/3/10 - 10:40 AM

  

  I think this might be a good validation expression
  
  ^(?:(?:http|https|ftp|telnet|gopher|ms\-help|file|notes)://)?(?:(?:[a-z][\w~%!&',;=\-\.$\(\)\*\+]*):.*@)?(?:(?:[a-z0-9][\w\-]*[a-z0-9]*\.)*(?:(?:(?:(?:[a-z0-9][\w\-]*[a-z0-9]*)(?:\.[a-z0-9]+)?)|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))(?::[0-9]+)?))?(?:(?:(?:/(?:[\w`~!$=;\-\+\.\^\(\)\|\{\}\[\]]|(?:%\d\d))+)*/(?:[\w`~!$=;\-\+\.\^\(\)\|\{\}\[\]]|(?:%\d\d))*)(?:\?[\^#]+)?(?:#[a-z0-9]\w*)?)?$

• #16 by ASM? on 1/3/10 - 10:48 AM

  

  This one for (http:// as optional) + [subdomain.]domain name/IP[.ext] required + path and query string etc as optional
  
  which means you will have at least a domain name
  
  ^(http://)?(?:(?:[a-z0-9][\w\-]*[a-z0-9]*\.)*(?:(?:(?:(?:[a-z0-9][\w\-]*[a-z0-9]*)(?:\.[a-z0-9]+)?)|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))(?::[0-9]+)?))(?:(?:(?:/(?:[\w`~!$=;\-\+\.\^\(\)\|\{\}\[\]]|(?:%\d\d))+)*/(?:[\w`~!$=;\-\+\.\^\(\)\|\{\}\[\]]|(?:%\d\d))*)(?:\?[\^#]+)?(?:#[a-z0-9]\w*)?)?$
  
  I hope this helps

• #17 by ASM on 1/3/10 - 3:22 PM

  

  I'm sorry, I think this is the final thing
  
  
  function IsValidRegEx($value:String, $regEx:Object):Boolean
  {
     if (!$value || !$regEx) return false;
     return ($value.match($regEx) != null);
  }
  
  function IsValidUri($value:String):Boolean
  {
     return IsValidRegEx($value, /^(?:(?:http|https|ftp|telnet|gopher|ms\-help|file|notes):\/\/)?(?:(?:[a-z][\w~%!&',;=\-\.$\(\)\*\+]*):.*@)?(?:(?:[a-z0-9][\w\-]*[a-z0-9]*\.)*(?:(?:(?:(?:[a-z0-9][\w\-]*[a-z0-9]*)(?:\.[a-z0-9]+)?)|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))(?::[0-9]+)?))?(?:(?:(?:\/(?:[\w`~!$=;\-\+\.\^\(\)\|\{\}\[\]]|(?:%\d\d))+)*\/(?:[\w`~!$=;\-\+\.\^\(\)\|\{\}\[\]]|(?:%\d\d))*)(?:\?[\^#]+)?(?:#[a-z0-9]\w*)?)?$/);
  }
  
  If you'd like to check only for http and without user name and password in url you can replace the expression with this one
  
  /^(?:http:\/\/)?(?:(?:[a-z0-9][\w\-]*[a-z0-9]*\.)*(?:(?:(?:(?:[a-z0-9][\w\-]*[a-z0-9]*)(?:\.[a-z0-9]+)?)|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))(?::[0-9]+)?))?(?:(?:(?:\/(?:[\w`~!$=;\-\+\.\^\(\)\|\{\}\[\]]|(?:%\d\d))+)*\/(?:[\w`~!$=;\-\+\.\^\(\)\|\{\}\[\]]|(?:%\d\d))*)(?:\?[\^#]+)?(?:#[a-z0-9]\w*)?)?$/