Warning: preg_match() [function.preg-match]: No ending delimiter ‘^’ found

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I am trying to resolve an issue I have been having with one of my wordpress plugins.

This is line 666

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function isUrl($url)
{
    return preg_match("^http://[-0-9a-z._]+.*$/i", trim( $url ));
}

What are your inputs on how I can resolve this warning? It’s quite irritating. I can’t figure it out and I’ve tried, researched everything!

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3 comments

  2. As it has been said in other answers, you have to use delimiters arround the regex. You have also the possibility to use another character than / to avoid escaping them:

    return preg_match("~^http://[-0-9a-z._]+.*$~i", trim( $url ));

    And you could use w that is shortcut of [a-zA-Z0-9_]:

    return preg_match("~^http://[-w.]+.*$~", trim( $url ));

  3. Your regex needs a delimiter around it, e.g. /

     return preg_match("/^http://[-0-9a-z._]+.*$/i", trim( $url ));

    This delimiter can be different characters but it must be the same before and after your regex. You could e.g. also do this

    ~regex~

    or

    #regex#

    The advantage is, use a delimiter that you don’t have inside the regex. If you use / as delimiter and want to match “/” you have to escape it inside the regex ///, if you change the delimiter you could do #/# to match a “/”