I need to add a few lines at the beginning of every subroutine, in about 50 perl files, each having about 10 subroutines.

I tried regular expressions as follows:

my $allText = read_file($file);

my $call = <<'END';
my @mars_caller =  caller(0);
mars::print::call(\@mars_caller, \@_);
END

$allText =~ s/([\n\s]+sub[\n\s]+.*?{)/\1$call/sg;

[download]

However this method is not so reliable as it found the word "sub" in a comment or print statement followed by some lines and then found a "{" somewhere else in the program and replaced that with the substitution string. Instead it should just find the real subroutine definitions.

I hope I've made my problem clear. Is there a better way to do this? Thanks for helping!

In reply to Changing every subroutine in many perl scripts by nitin1704

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