D41947.diff
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	diff --git a/lib/libc/regex/regcomp.c b/lib/libc/regex/regcomp.c
	--- a/lib/libc/regex/regcomp.c
	+++ b/lib/libc/regex/regcomp.c
	@@ -828,10 +828,10 @@
	handled = false;

	assert(MORE()); /* caller should have ensured this */
	- c = GETNEXT();
	+ c = (uch)GETNEXT();
	if (c == '\\') {
	(void)REQUIRE(MORE(), REG_EESCAPE);
	- cc = GETNEXT();
	+ cc = (uch)GETNEXT();
	c = BACKSL \| cc;
	#ifdef LIBREGEX
	if (p->gnuext) {
	@@ -992,7 +992,7 @@
	int ndigits = 0;

	while (MORE() && isdigit((uch)PEEK()) && count <= DUPMAX) {
	- count = count*10 + (GETNEXT() - '0');
	+ count = count*10 + ((uch)GETNEXT() - '0');
	ndigits++;
	}

	@@ -1302,7 +1302,7 @@

	if ((p->pflags & PFLAG_LEGACY_ESC) != 0)
	return (true);
	- if (isalpha(ch) \|\| ch == '\'' \|\| ch == '`')
	+ if (iswalpha(ch) \|\| ch == '\'' \|\| ch == '`')
	return (false);
	return (true);
	#ifdef NOTYET