From "perldoc perlvar":

$1... Contains the subpattern from the corresponding set of capturing parentheses from the last successful pattern match

Some of your regexen do have capture but not all of them.

If the last regex tested does NOT have (capturing parens), $1 will not have a value, resulting the warning you are getting.

If you expect the URL only after "Archive", you can capture it thus: 

 ... && my ($url)= $line =~ m/\/Archives(.*)/img && ...

[download]

        This is not an optical illusion, it just looks like one.

In reply to Re: Series of REGEX with OR by NetWallah
in thread Series of REGEX with OR by wrkrbeee

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