PHP :: Bug #17957 :: Empty backreferences broken

Bug #17957	Empty backreferences broken
Submitted:	2002-06-24 18:08 UTC	Modified:	2002-09-24 11:42 UTC
From:	john at scl dot co dot uk	Assigned:
Status:	Closed	Package:	Regexps related
PHP Version:	4.3.0-dev	OS:	Linux 2.2.19
Private report:	No	CVE-ID:	None

[2002-06-24 18:08 UTC] john at scl dot co dot uk

<?

echo ereg_replace("^(a*)",'\1','a')."\n";
echo ereg_replace("^(a*)",'\1','b')."\n";

echo ereg_replace("^(a)*",'\1','a')."\n";
echo ereg_replace("^(a)*",'\1','b')."\n";

?>

produces:
a
b
a
\1b

should produce:
a
b
a
b

'./configure' '--with-apxs=/usr/sbin/apxs' '--with-config-file-path=/usr/lib' '--with-curl'
'--with-pdflib=shared' '--with-mcrypt' '--with-pcre' '--with-dom' '--with-pear' '--with-xml=shared' '--with-zlib-dir=/usr' '--prefix=/usr' '--enable-debug=no' '--enable-safe-mode' '--with-exec-dir=/usr/bin' '--with-mysql=/usr' '--with-regex=system'

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[2002-07-09 06:34 UTC] john at scl dot co dot uk

Tried it with 4.3.0-dev downloaded from CVS this morning
and result is same. (Not sure if this is same as 
http://snaps.php.net?)

[2002-09-24 11:42 UTC] iliaa@php.net

This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at http://snaps.php.net/.
 
In case this was a documentation problem, the fix will show up soon at
http://www.php.net/manual/.

In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites in short time.
 
Thank you for the report, and for helping us make PHP better.