Regex problem : matches empty strings

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1 total messages Started by T.Day Sun, 26 Nov 1989 16:47

#193

Author: T.Day
Date: Sun, 26 Nov 1989 16:47

24 lines
767 bytes

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

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