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Re^2: regex gotcha moving from 5.8.8 to 5.30.0?

by swl (Priest)
on Feb 10, 2021 at 21:37 UTC ( #11128198=note: print w/replies, xml ) Need Help??


in reply to Re: regex gotcha moving from 5.8.8 to 5.30.0?
in thread regex gotcha moving from 5.8.8 to 5.30.0?

Just a guess, but the delta for 5.20 includes this entry:

Executing a regex that contains the ^ anchor (or its variant under the /m flag) has been made much faster in several situations.

https://metacpan.org/pod/release/RJBS/perl-5.20.0/pod/perldelta.pod#Performance-Enhancements

Maybe that enhancement has some side effects triggered by the \s* ^ \s* patterns in the regexps.

Are you able to test what happens in pre-5.20 if these patterns are changed to \s*?

Edit - I should have asked for what happens either side of 5.20.

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