Re: The story of a strange line of code: pos($_) = pos($

let's assume that I wrote [qr/[A-Za-z0-9_\-\.]*/, "word"], instead of [qr/[A-Za-z0-9_\-\.]+/, "word"]

Couldn't that give you an infinite loop? ( Your particular set of rules and code layout is immune, but that's not always going to be the case. ) If so, reseting pos() is making things worse. An error you used to catch (with a misleading error message) now fails badly.

While it's an interesting tidbit, the need for the construct in a tokeniser is a strong indicator of an error elsewhere (as is the case here).

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Re^2: The story of a strange line of code: pos($_) = pos($_); by ambrus (Abbot) on Mar 10, 2010 at 13:15 UTC
No, it can't give an infinite loop, exactly because of the empty match rule. As I noted in the very last paragraph in the post, resetting pos is not making this worse because we don't recall the main regexen from `@toktab` after we reset pos.	[reply] [d/l]