in reply to Re^2: Using Look-ahead and Look-behind
in thread Using Look-ahead and Look-behind

I changed the sub TestEquity to allow for any text between Private and Equity, but I can't get it to work. What have I done wrong?

sub TestEquity {
    return 1 if $_[0] =~ m/(?<!private).*equity/;
    return 0;
}

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Re^4: Using Look-ahead and Look-behind
by AnomalousMonk (Archbishop) on Jun 19, 2014 at 12:09 UTC

    How about just (untested, and also case-sensitive): 

    sub TestEquity {
  return 
    $_[0] =~ m/private.*equity/ ? 0 :
    $_[0] =~ m/equity/          ? 1 :
                                  0
    ;
    }

    [download]
    This could be slightly simplified if you can tolerate  "" (empty string) as a false flag in addition to or in place of 0.

    BTW: "I can't get it to work" is rarely helpful as a problem description. How about some input strings and actual versus expected output?

    Update: Changed  $_[0] =~ m/private.*equity/ to  $_[0] =~ m/private/ because it makes more sense.
    Update: ... and then changed it back to  $_[0] =~ m/private.*equity/ because it actually makes even more sense that way! (sigh)

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Re^4: Using Look-ahead and Look-behind
by Anonymous Monk on Jun 19, 2014 at 23:13 UTC

    I changed the sub TestEquity to allow for any text between Private and Equity, but I can't get it to work. What have I done wrong?

    Impossible to say, although the anomalous one makes a good point

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