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

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

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I don't get [^.]. 'Splain? :)

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Re: Re: Re: Re: Re: Regex to match file extension in URL
by Trimbach (Curate) on Sep 09, 2001 at 19:07 UTC
    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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