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You're right: the \bs in the pattern do seem to sabotage $1. In particular, any char in front of the () group kills the $1, if the g and i switches are both set.
my $line = 'She was very absorbed in her homework.'; my $word = 'absorb'; $_=$line; s/ ($word)//g; print "\$1 is $1\n"; $_=$line; s/ ($word)//i; print "\$1 is $1\n"; $_=$line; s/ ($word)//ig; print "\$1 is $1\n";
One other note:
#This also fails s/(\b$word)//ig; #Although this is ok s/( $word)//ig; #And this is fine, too! my $pat = qr/\b($word)/; s/$pat//gi; #or even my $pat = qr/($word)/; s/\b$pat//gi; #or EVEN THIS! my $pat = qr/$word/; s/\b($word)//gi;
I think we have a perlbug. Frenzy of updates completed. Really.

In reply to Re... quick question about parentheses and regular expressions by Roy Johnson
in thread quick question about parenthesis and regular expressions by cranberry13

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