#!/usr/bin/perl -w

BEGIN {undef $/;}


# I TRIED 1ST my $match = "^module.*?$ARGV[2].*?([\\(;])"; 2ND my $match = "\^module.*?$ARGV[2].*?([\\(;])"; 3RD my $match = "\\^module.*?$ARGV[2].*?([\\(;])"

#"(?<=module )$ARGV[2]"
my $match = "(?<=module )$ARGV[2].*?([\\(;])";
#print "$match";

my $filename = $ARGV[0];

open (INFILE, "<", $filename)  or  die "Failed to read file $filename : $! \n";

$string =  <INFILE>;
close INFILE;



#I TRIED "$string =~ s/^$match/module $ARGV[1]$1/sg;";

$string =~ s/$match/$ARGV[1]$1/sg;
#print "$1";


open OUTFILE, ">$ARGV[0]" || die "Failed to create $ARGV[0]\n";
print OUTFILE ($string);
close OUTFILE;
##</code><code>##

use Modern::Perl;

my $filename = $ARGV[0];

die "Usage: modulenamechanger.pl filename newmodulename oldmodulename\
+n"
  unless @ARGV == 3;

open my $INFILE, "<", $filename or die "Failed to read file $filename 
+: $!";
say "Now parsing $filename";
my @file = <$INFILE>;
close $INFILE;

open my $OUTFILE, '>', $filename or die "Failed to create $filename";

my $match = qr "module\s*($ARGV[2])";
say "Matching: $match";

for my $line (@file) {
    if ( $line =~ m(^//) ) {
        print $OUTFILE $line;
        next;
    }
    $line =~ s/$match/module $ARGV[1]/;
    print $OUTFILE $line;
}
##</code><code>##

my $match = "(?<=module )$ARGV[2].*?([\\(;])";

##</code><code>##

#!/usr/bin/perl -w

BEGIN {undef $/;}

#use Modern::Perl;

my $filename = $ARGV[0];

die "Usage: modulenamechanger.pl filename newmodulename oldmodulename\
+n"
  unless @ARGV == 3;

open my $INFILE, "<", $filename or die "Failed to read file $filename 
+: $!";
print "Now parsing $filename\n";
my @file = <$INFILE>;
close $INFILE;

open my $OUTFILE, '>', $filename or die "Failed to create $filename";

# WITHOUT ABANSAL CONCEPT my $match = qr "module\s*($ARGV[2])";
my $match = "(?<=module )$ARGV[2].*?([\\(;])";

print "Matching: $match\n";

for my $line (@file) {
    print "READING LINE $line \n";
    if ( $line =~ m(^//) ) {
        print "INSIDE IF\n";
        print $OUTFILE $line;
        next;
    }
    else 
    {

print "INSIDE ELSE \n BEFORE change:\t $line\n";
    $line =~ s/$match/moduleXXX $ARGV[1]/;
print "AFTER :\t $line\n";
    print $OUTFILE $line;
    next; 
    }
}
##</code><code>##

my.pl f7 NEW OLD
Now parsing f7
Matching: (?<=module )OLD.*?([\(;])
READING LINE //Verilog HDL for "tt", "hh" "functional"
// if i write the word module OLD(Y, A, B ); here the script goofs up
`timescale 1ps/10fs


module OLD(Y, A, B );
    output Y;
    input A;
    input B;

endmodule

INSIDE IF