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Asked: 2026-06-13T06:05:36+00:00

My code is: if (!preg_match(‘^http(s)?://(*)?\.mysite.com(\*)^’, $url)) { echo <strong>Error</strong>: Invalid mysite.com link or could

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My code is:

if (!preg_match('^http(s)?://(*)?\.mysite.com(\*)^', $url))
{
  echo "<strong>Error</strong>: Invalid mysite.com link or could shorten link";
}

and I got:

Warning: preg_match() [function.preg-match]: 
  Compilation failed: nothing to repeat at offset 12

I am working on a link shortner, similar to bit.ly, but I only want it to shorten links from my specific site.

I need some help with this error.

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1 Answer

  1. Editorial Team

    The asterisk or star tells the engine to attempt to match the preceding token zero or more times.

    if (!preg_match('^http(s)?://(*)?\.mysite.com(\*)^', $url))
                              ↑
                       nothing to match

    I believe your regex pattern contains multiple errors. I suggest you to go with

    if (!preg_match('/^https?:\/\/(?:[a-z\d-]+\.)*mysite.com(?:(?=\/)|$)/i', $url))
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