Thanks for the comments AppleFritter

I don't want to do the regex $line =~ s/\s*#.*$//; becuse it might be in the pattern. such as 

pattern = the number is #8  # number

[download]

where #8 is in the pattern

and # number is a comment

I was hoping that i could do a look behind and catch it that way.

But corion's way of doing this is really the same thing. 

$line =~ s!#.*$!!; # strip off comments
my( $key, $value ) = split /=/, $line;

[download]

In reply to Re^2: Regex to ignore comment by crusty_collins
in thread Regex to ignore comment by crusty_collins

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