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libregex: fix our mapping for \w

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A small oversight in our implementation of \w is that it's actually
not strictly [[:alnum:]].  According to the GNU documentation, it's
actually [[:alnum:]] + underscore.  The fix is rather trivial: just add
it to our set explicitly, and amend our test set to be sure that _ is
actually included.

PR:		287396
This commit is contained in:
Kyle Evans 2025-08-08 13:21:03 -05:00
parent 619feb9dd0
commit d0ff5773ce
2 changed files with 4 additions and 3 deletions
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1
lib/libc/regex/regcomp.c
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@ -1183,6 +1183,7 @@ p_b_pseudoclass(struct parse *p, char c) {
/* PASSTHROUGH */
case 'w':
p_b_cclass_named(p, cs, "alnum");
CHadd(p, cs, '_');
break;
case 'S':
cs->invert = 1;

6
lib/libregex/tests/gnuext.in
View file

@ -10,9 +10,9 @@ a\|b\|c b abc a
(ab)\1 - abab abab
\1(ab) C ESUBREG
(a)(b)(c)(d)(e)(f)(g)(h)(i)\9 - abcdefghii abcdefghii
# \w, \W, \s, \S (alnum, ^alnum, space, ^space)
\w+ - -%@a0X- a0X
\w\+ b -%@a0X- a0X
# \w, \W, \s, \S (_alnum, ^_alnum, space, ^space)
\w+ - -%@a_0X- a_0X
\w\+ b -%@a_0X- a_0X
\s+ - aSNTb SNT
\s\+ b aSNTb SNT
# Word boundaries (\b, \B, \<, \>, \`, \')