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).

In reply to Re: The story of a strange line of code: pos($_) = pos($_); by ikegami
in thread The story of a strange line of code: pos($_) = pos($_); by ambrus

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