#!/usr/local/bin/perl 

for (my $c = 1;; $c ++) {
    my $file = "graph_set_$c.out";
    last unless -f $file;
    open my $fh => "<", $file or die "Failed to open $file: $!";

local $/ = undef;   	# undef record seperator
my $string = <IN>;     	# read whole file into string    
close (IN);

my @gset_match = ($string =~ /([A-Z]\s\d+,\s\d+\(\s*\d+\))/g);

open (TEXT, ">graph_set.txt") or die "Can't create graph_set.txt: $!\n";
foreach $_(@gset_match) { print TEXT "$_\n"; }
close TEXT; 
}