Treat "#" and the following characters as a single whitespace character. 

/\G (?: \s | \# .* )++ /xgc

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More efficient? 

/\G (?: \s++ | \# .*+ )++ /xgc

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In reply to Re: Simple way to skip spaces and # comments by ikegami
in thread Simple way to skip spaces and # comments by leszekdubiel

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