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Editorial Team
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Asked: 2026-05-17T15:37:55+00:00

I want to match a URL link in a wall post and replace this

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I want to match a URL link in a wall post and replace this link with anchor tag. For this I use the regular expression below.

I would like the match four types of URL:

  1. http://example.com
  2. https://example.com
  3. www.example.com
  4. example.com
preg_replace('@(https?://([-\w\.]+)+(:\d+)?(/([\w/_\.]*(\?\S+)?)?)?)@',
             '<a href="$1">$1</a>', $subject);

This expression matches only first two types of URL.

If I use this expression for matching a URL pattern,
'@(www?([-\w\.]+)+(:\d+)?(/([\w/_\.]*(\?\S+)?)?)?)@', it only matches the third type of URL pattern.

How can I match all four typeS of URL patternS with a single regular expression?

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1 Answer

  1. Editorial Team

    I’d use a different regex to be honest. Like this one that Gruber posted in 2009:

    \b(([\w-]+://?|www[.])[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/)))

    Or this updated version that Gruber posted in 2010 (thanks, @IMSoP):

    (?i)\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'".,<>?«»“”‘’]))
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