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It doesn't mean what you think it means

by Fletch (Chancellor)
on Apr 11, 2002 at 13:14 UTC ( #158306=note: print w/ replies, xml ) Need Help??


in reply to Compiling regular expressions to perform substitution

qr// only compiles regular expressions, not substitution operators. What you've done is compiled a regular expression for matching `s/foo/bar/g'. You can use compiled regexen on the left hand side of an s/// expression, but you can't use one to capture the whole expression.

Now if what you're trying to do is capture an operation or three to be performed on a string that you can select programattically, you possibly could use a hash of coderef like this:

my %mungers = ( foo => sub { $_[0] =~ s/foo/bar/g }, fru => sub { $_[0] =~ s/(fru.*)/uc($1)/e }, ); if( $phase_of_moon > WAXING_GIBBOUS ) { $mungers->{foo}->( $string ); } else { $mungers->{fru}->( $string ); }

Update: Feh, as was pointed out that first -> inside the if/else blocks is extraneous. That's what I get for posting while trying to eat breakfast.


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Re: It doesn't mean what you think it means
by Stegalex (Chaplain) on Apr 11, 2002 at 15:05 UTC
    Slight modification needed to make this compile. Here it is:
    my %mungers = ( foo => sub { $_[0] =~ s/foo/bar/g }, fru => sub { $_[0] =~ s/(fru.*)/uc($1)/e }, ); if( $phase_of_moon > WAXING_GIBBOUS ) { $mungers{foo}->( $string ); # this line changed } else { $mungers{fru}->( $string ); # this line changed }
    Again, thanks for everyone's help. I like chicken.

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