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Re: Re: Open to suggestions on a search and replace..

by tachyon (Chancellor)
on Apr 12, 2002 at 11:05 UTC ( #158541=note: print w/ replies, xml ) Need Help??


in reply to Re: Open to suggestions on a search and replace..
in thread Open to suggestions on a search and replace..

You can use a positive lookahead assertion to avoid having to reinsert $1.

$line =~ s/^(?=R.*\$SUB=)<\*\d+>//;

cheers

tachyon

s&&rsenoyhcatreve&&&s&n.+t&"$'$`$\"$\&"&ee&&y&srve&&d&&print


Comment on Re: Re: Open to suggestions on a search and replace..
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Re3: Open to suggestions on a search and replace..
by Hofmator (Curate) on Apr 12, 2002 at 11:38 UTC
    You can use a positive lookahead assertion to avoid having to reinsert $1. $line =~ s/^(?=R.*\$SUB=)<\*\d+>//;

    aehhm, this won't work. The lookahead doesn't move the position in your regex, so you are effectively looking for /^<\*\d+>/ which isn't there. Instead you would need a look behind assertion but they are only available for constant length.

    As I understand the file format there are no other digits in angle brackets starting with a star. So why not simply write: s/<\*\d+>//;

    Update: As of Rhodium's clarification of the specs, I would now fully recommend IO's solution.

    -- Hofmator

      Hey Hof,
      As I understand the file format there are no other digits in angle brackets starting with a star.
      That is something I don't want to assume..
      Rhodium

      The <it>seeker</it> of perl wisdom.

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