Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!uunet!mcsun!ukc!kl-cs!nott-cs!ucl-cs!T.Day
From: T.Day@ucl-cs.UUCP
Newsgroups: gnu.g++.lib.bug
Subject: Regex problem : matches empty strings
Message-ID: <472@ucl-cs.UUCP>
Date: 26 Nov 89 16:47:58 GMT
Sender: T.Day@ucl-cs.UUCP
Lines: 24

From: Tim Day <T.Day@uk.ac.ucl.cs>

On a Sun-3 (OS4) with ``gcc version 1.36.1 (based on GCC 1.36)''
comparing any empty string with a Regex always seems to evaluate to TRUE.
e.g....

#include <stream.h>
#include <String.h>

main()
{	if (String("").matches(Regex("xxx")))
		cerr << "OOPS!\n";
	else cerr << "OK\n";

	if (String("yyy").matches(Regex("xxx")))
		cerr << "OOPS\n";
	else cerr << "OK\n";

	exit(0);
}

Outputs:
OOPS!
OK