Well, you don't say what your problem is, but you'll have a hard time reading the DATA section like that. The correct token name is __DATA__, not ___DATA___.

Try this: 

use strict; use warnings; use feature 'say';

while ( my $line = <DATA> ) {
    chomp $line;
    say replace( $line, 'SUBSTR', 'FOO' );
}

sub replace {
    my ( $input, $wanted, $replacement ) = @_;
    return $input =~ s/$wanted/$replacement/gr;
}

__DATA__
path/to/some/file
path/to/some/other/file
path/to/SUBSTR/file #replace entire line if SUBSTRING is found
path/to/file

[download]
Note the use of the /r modifier to the substitution so that it returns the result rather than the count of matches. ( This requires Perl version 5.14 or newer. If your Perl installation is older than that, use $input =~ s/$wanted/$replacement/g; return $input; )

Output: 

path/to/some/file
path/to/some/other/file
path/to/FOO/file #replace entire line if FOOING is found
path/to/file

[download]

Hope this helps (but I am only guessing since you didn't pose a question)!

Edit: changed 'filehandle' to 'token', thanks shmem.

The way forward always starts with a minimal test.

In reply to Re: Replacing an entire line if a substring is found by 1nickt
in thread Replacing an entire line if a substring is found by victorz22

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