2012-06-11  Yaakov Selkowitz  <yselkowitz@...>

	* regex/regcomp.c (p_ere): Allow vertical-line following
	left-parenthesis in ERE, as in glibc.

Index: regex/regcomp.c
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/regex/regcomp.c,v
retrieving revision 1.13
diff -u -p -r1.13 regcomp.c
--- regex/regcomp.c	13 Feb 2012 13:12:37 -0000	1.13
+++ regex/regcomp.c	11 Jun 2012 20:41:15 -0000
@@ -324,7 +324,10 @@ p_ere(struct parse *p,
 		conc = HERE();
 		while (MORE() && (c = PEEK()) != '|' && c != stop)
 			p_ere_exp(p);
+#ifndef __CYGWIN__
+		/* undefined behaviour according to POSIX; allowed by glibc */
 		(void)REQUIRE(HERE() != conc, REG_EMPTY);	/* require nonempty */
+#endif
 
 		if (!EAT('|'))
 			break;		/* NOTE BREAK OUT */