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up vote 4 down vote favorite
1

This question already has an answer here:

I know the question title looks very repetitive. But some of the solution i did not find here.

I need to find urls form text string:

$pattern = '`.*?((http|https)://[\w#$&+,\/:;[email protected]]+)[^\w#$&+,\/:;[email protected]]*?`i';

    if (preg_match_all($pattern,$url_string,$matches)) {
        print_r($matches[1]);
    }

using this pattern i was able to find urls with http:// and https:// which is okey. But i have user input where people add url like www.domain.com even domain.com

So, i need to validate the string first where i can replace www.domain.com domain.com with common protocol http:// before them. Or i need to comeup with more good pattern?

I am not good with regex and don't know what to do.

My idea is first finding the urls with http:// and https:// the put them in an array then replace these url with space(" ") in the text string then use other patterns for it. But i am not sure what pattern to use.

I am using this $url_string = preg_replace($pattern, ' ', $url_string ); but that removes if any www.domain.com or domain.com url between two valid url with http:// or https://

If you can help that will be great.

To make things more clear:

i need a pattern or some other method where i can find all urls in a text sting. the example of url are:

  1. domain.com
  2. www.domain.com
  3. http://www.domain.com
  4. http://domain.com
  5. https://www.domain.com
  6. https://domain.com

thanks! 5.

share|improve this question

marked as duplicate by hakre, cryptic ツ, Glavić, HamZa, PeeHaa Jan 1 '14 at 23:48

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
    
Are you validating user input from a form with a URL field? Or are you scraping a page/block of text to generate a list of URLs found inside of it? A complete example of the "text string" you are trying to parse might be helpful. –  baraboom May 25 '11 at 16:54
    
@baraboom: yes, from user input textbox. where people may input like this twitter : twitter.com/user facebook: facebook.com etc.. –  Sisir May 25 '11 at 17:26

2 Answers 2

up vote 3 down vote accepted 
$pattern = '#(www\.|https?://)?[a-z0-9]+\.[a-z0-9]{2,4}\S*#i';
preg_match_all($pattern, $str, $matches, PREG_PATTERN_ORDER);
share|improve this answer
    
Thanks! almost worked!! Still need to find the pattern domain.com –  Sisir May 25 '11 at 17:37
1  
@Sisir replace the {1} with a ? to make the http:// or www optional. –  Jonathan Kuhn May 25 '11 at 21:00
    
This does not work for me. I receive an empty results. $pattern = '#(www\.|https?:\/\/){?}[a-zA-Z0-9]{2,254}\.[a-zA-Z0-9]{2,4}(\S*)#i'; $count = preg_match_all($pattern, 'http://www.Imaurl.com', $matches, PREG_PATTERN_ORDER); And there is no error from preg_last_error() –  Shane Jul 31 '13 at 20:41
    
Copying and pasting this into an interactive PHP shell I also get blank results. Also, the {2,254} limit doesn't support domains like t.co which are gaining popularity these days. Tried to edit the answer, but an edit must be >6 characters apparently :-( Oh, and I don't think this will match domains like me-too.com. –  chmac Sep 26 '13 at 11:26
up vote 0 down vote

I'm not sure if I've understood what you need correctly, but can you use something like this: 

preg_match('#^.+?://#', $url);

to find if there is a protocol specified on the string, and if not just append http://

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