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All the Perl that's Practical to Extract and Report

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  • Your main question has already been answered, but you also asked why the + was there and why it wasn't \b.

    The + is actually irrelevant - it could be removed. /^\d+/ looks at the beginning of the matched text (^) for one digit (\d) or more digits (+). If the plus were changed to \b, it would require exactly one digit and disallow the line if that digit was immediately followed by an alphanumeric. If the + were removed, it would look for one digit at the start of a line (and if a line starts with one or more