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Re: Best practice or cargo cult?

by GrandFather (Sage)
on Jun 20, 2006 at 21:04 UTC ( #556528=note: print w/replies, xml ) Need Help??

in reply to Best practice or cargo cult?

Anything done all the time "because someone said so" is "cargo cult".

However, just because it is "cargo cult" doesn't mean it can't be a best practice. So the question more usefully becomes "Is always using xms on regexen a good idea?".

Personally I can see the justification for generally using /x and /s - they tend to avoid surprises, like when a chunk of whitespace is a tab rather than the space expected and treating all characters in a non-special way (/s) saves involving a couple of brain cells during processing more often than it requires them.

But /m is a beast of a different stripe requiring a significant switch of meaning for ^ and $. I haven't read the book (books are expensive here and Perl is something of a "sideline" for me) so I don't know the justification, but I'd be inclined to leave the /m switch off.

DWIM is Perl's answer to Gödel

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Re^2: Best practice or cargo cult?
by sgt (Deacon) on Jan 28, 2007 at 22:43 UTC

    I agree. There is also another problem I see; as the ms flags have been used much less, it is possible they are buggier. Quite a few optimization bugs have been found in the m case (and some discussed here actually).

    cheers --stephan

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