Re: Capture only first match in regular expression

Discussion in 'Perl' started by Peter Tuente, Apr 17, 2009.

  1. Peter Tuente

    Peter Tuente Guest

    Hi Zapanaz,

    the default behaviour of regular expression terms is to be "greedy", so to
    suppress this behaviour to become "not greedy" you have to apply a single
    question mark "?" right after the desired expression(s). Sounds some kind of
    complex, but I hope you get me ;-)

    In your case the following should be sufficient:

    # old: if($content =~ /.*(<a.*<\/a>).*/i){
    $anchorContent = $1;

    # new:
    if($content =~ /.*?(<a.*?<\/a>).*/i){
    $anchorContent = $1;

    The effect is, that the first expression ".*" becomes not so greedy eating
    all the possible chars (incl. one/some "<a" chars that prefix the last
    occurrence of "<a" in the current line). Same with the second ".*".

    Hope this helps ;-)

    Bye.

    PiT
     
    Peter Tuente, Apr 17, 2009
    #1
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