Re: [PATCH v5 4/8] regex.3: Improve REG_STARTEND

[наб <nabijaczleweli@xxxxxxxxxxxxxxxxxx>]

On Thu, Apr 20, 2023 at 09:30:06PM +0200, наб wrote:
> If REG_STARTEND, pmatch must point to a valid readable object.
> (Naturally, if you pass in uninitialised memory or a null pointer,
>  then you get UB.)
> nmatch is not consulted and has no bearing on this.
This is all to say:
  regexec(&reg, "str", 0, &rm, REG_STARTEND);
is valid, looks in ["str"+rm.so, "str"+rm.eo),
and doesn't change rm, whereas
  regexec(&reg, "str", 1, &rm, REG_STARTEND);
is valid, looks in ["str"+rm.so, "str"+rm.eo),
and will update rm with the match, if any.

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