I'm trying to exec regexp on directory tree using folowing script, but substitution regexp doesn't allow me to use \1 or $1 as parameter, so following example doesn't work. 
#!/usr/bin/perl

use    warnings;
use    strict;
use    File::Find;

my $base = "C:\\Projects\\test";
my $ext = qr/.cpp$/;
my $regexp = qr/throw "(.+)"/;
my $substitute = qq{throw \("$1"\)};

find(\&process, $base);

# Collect files matching pre-set extension
sub    process {
        /$ext/ or return;
        my ($line, $file);

        $file =    $File::Find::name;
        $file =~ s{/}{\\}g;

        open (IN, '<', $file) or die "Can not open $file: $!";
        while (defined($line = <IN>)) {
            next if $line !~ /$regexp/;    
            chomp $line;
            print "$file:\n\t$line\n";
            $line =~ s/$regexp/$substitute/;
            print "\t$line\n";
        }
        close(IN);
}

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In reply to Execute regexp on directory tree by karmas

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