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Re: use of constants in regex substitutions?

by perlmonkey (Hermit)
on Sep 23, 2003 at 01:38 UTC ( #293357=note: print w/ replies, xml ) Need Help??

in reply to use of constants in regex substitutions?

This is probably overkill, but you can create a tied object wrapper to do the look ups. This will be a bit slow, but if you dont need speed, it might be interesting to look at.
use strict; my $str = "foobar"; my $c = MyConstants->new(); print "str = $str\n"; $str =~ s/$c->{Foo}/$c->{Bar}/; print "str = $str\n"; print "Bar = $c->{bar}"; package MyConstants; use constant Foo => "foo"; use constant Bar => "bar"; use Tie::Hash; use base qw(Tie::StdHash); use Carp qw(croak); sub new { tie my %self, $_[0]; return bless \%self, $_[0]; } sub FETCH { if( $_[0]->can($_[1]) ) { goto &{$_[1]}; } else { croak("Undefined constant \"$_[1]\" called"); } }
str = foobar str = barbar Undefined constant "bar" called at /tmp/ line 8
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