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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.misc
Subject: Re: Command Languages Versus Programming Languages
Date: Sun, 24 Nov 2024 06:42:59 -0800
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Rainer Weikusat <rweikusat@talktalk.net> writes:

> Janis Papanagnou <janis_papanagnou+ng@hotmail.com> writes:
>
> [...]
>
>> Personally I think that writing bulky procedural stuff for
>> something like [0-9]+ can only be much worse, and that further
>> abbreviations like \d+ are the better direction to go if targeting
>> a good interface.  YMMV.
>
> Assuming that p is a pointer to the current position in a string, e
> is a pointer to the end of it (ie, point just past the last byte)
> and - that's important - both are pointers to unsigned quantities,
> the 'bulky' C equivalent of [0-9]+ is
>
> while (p < e && *p - '0' < 10) ++p;

To force the comparison to be done as unsigned:

  while (p < e && *p - '0' < 10u) ++p;