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Bug #8610 ereg* complains without cause
Submitted: 2001-01-09 03:51 UTC Modified: 2001-01-09 04:19 UTC
From: sam at ananova dot com Assigned:
Status: Closed Package: Regexps related
PHP Version: 4.0.4 OS: solaris 2.7
Private report: No CVE-ID: None
 [2001-01-09 03:51 UTC] sam at ananova dot com
if (eregi('^(ab|)c$',$x)) print "blah: $x<br>\n";

complains with 
Warning: REG_EMPTY in /usr/local/ananova_v2/www/search/_index.php on line 31

and returns false regardless of $x


echo "c" | egrep '^(ab|)c$'
echo "ac" | egrep '^(ab|)c$'
echo "abc" | egrep '^(ab|)c$'


Removing the from my php expression | stops the complaint but ruins the pattern.

My pattern intends to read (in english)
Optionally prefixed by "ab" and matches "c" exactly.


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 [2001-01-09 03:53 UTC] sam at ananova dot com
Corrected bug type
 [2001-01-09 04:19 UTC]
I don't consider this a bug, and if you still think it is you will need to take it up with Henry Spencer.  According to Henry ab| is not valid as per Posix 1003.2.  Check out the php4/regex/tests file.  He specifically tests for this and says it should return EMPTY.  The workaround is to either use (ab|()) or use preg_match() instead.
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