in reply to Re: Regex to match file extension in URL
in thread Regex to match file extension in URL

Sorry if that wasn't clear. What I need is a regex to match the extension of the remote file, whatever it is, not just if it's .html. The $myvar was just an example.
  • Comment on Re: Re: Regex to match file extension in URL

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Re: Re: Re: Regex to match file extension in URL
by Trimbach (Curate) on Sep 09, 2001 at 16:44 UTC
    If that's the case, then how about 
    if ($myvar =~ m/\.([^.]+)$/) {
print "Matched $1";
}

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    Of course, this won't work for URL's with an implicit filename, like "http://www.yahoo.com" or "http://www.somewhere.com/home/" You'll have to catch those bad boys elsewhere in your code.

    Gary Blackburn
    Trained Killer

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      Let me break this down and learn :) 
      \.    # literal period
    (    # start capture
        [^.]   # any character that's not...any character?
            +    # one or more of them
    )    # stop capture
$    # end of line

      [download]
      I don't get [^.]. 'Splain? :)
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        You got it right, except for the negated character class. Because the metacharacter "." is meaningless inside a character class (because "." and [.] would be the same thing) the period means a literal period inside a character class. So the regex is actually: 
        
\.    # literal period
    (    # start capture
        [^.]   # any character that's not a period
            +    # one or more of them
    )    # stop capture
$    # end of line

        [download]
        This guarantees that you'll get the last chunk of non-periods at the end of URL... but beware because like I said "http://www.yahoo.com" will match "com", and "http://www.somewhere.com/home/" will match "com/home/".

        Gary Blackburn
        Trained Killer

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