if(/^HEADER(.*?)GENRE_BY(.*)/

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isn't a regex.

You left out the close paren (for the "if" condition) that was in the OP, but apart from that, it is a regex. It is doing a match on $_, which is a normal and sensible thing to do.

In reply to Re^2: Question on RE based matching by graff
in thread Question on RE based matching by noobee

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