Very nice! So all wrapped up and ready to go you would have: 

my $str = "abcdefghijafjafjkagjakg";
my $pat = '(a.)';
my $repl = '$1 ';
print munge($str,$pat,$repl);

=head2 munge( STRING, PATTERN, REPLACEMENT )

The munge function takes three arguments and returns a string. 
The first argument is the STRING to be modified. 
The modification is performed by s/PATTERN/REPLACEMENT/g.
The main advantage of this function is that REPLACEMENT 
can contain $1, $2 etc that have been captured by PATTERN
These values are safely interpolated prior to the substitution
being made.

=cut

sub munge {
    my($str, $pat, $repl) = @_;
    $str =~ s/$pat/_safeswitch($repl)/eg;
  return $str;
}

# used by munge function to safely interpolate
# $1, $2 etc into the replacement string
sub _safeswitch {
    my @P = (undef,$1,$2,$3,$4,$5,$6,$7,$8,$9);
    $_[0] =~ s/\$(\d)/$P[$1]/g;
    $_[0];
}

[download]

cheers

tachyon

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

In reply to Re: Re: $1 in variable regex replacement string by tachyon
in thread $1 in variable regex replacement string by dvergin

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