Either escape it as s/(\d+)C/($1*9\/5)+32 . "F"/ge; or change the delimiter so there isn't a conflict like s|(\d+)C|($1*9/5)+32 . "F"|ge;. perlre has more examples of this.

In reply to Re: regexp - how to embed a "/" within the executable part of the regexp when using /e by diotalevi
in thread regexp - how to embed a "/" within the executable part of the regexp when using /e by princepawn

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