Bug #17616: backslash characters handled oddly in preg_replace

From: john43@temple.edu Operating system: linux 2.4.14, pcre PHP version: 4.1.2 PHP Bug Type: PCRE related Bug description: backslash characters handled oddly in preg_replace Below are two calls to preg_replace() with different replacement strings. For some reason, they both return the same string. $s = "A backslash: \\ "; $s1 = preg_replace("/\\\\/", "\\\\\\", $s); $s2 = preg_replace("/\\\\/", "\\\\\\\\", $s); echo "s : $s \n"; echo "s1: $s1 \n"; echo "s2: $s2 \n"; ------------------ Output: s : A backslash: \ s1: A backslash: \\ s2: A backslash: \\ ------------------ My configuration: './configure' '--with-gnu-ld' '--with-apxs=/usr/local/apache/bin/apxs' '--with-mysql=/usr/local/mysql' -- Edit bug report at http://bugs.php.net/?id=17616&edit=1 -- Fixed in CVS: http://bugs.php.net/fix.php?id=17616&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=17616&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=17616&r=needtrace Try newer version: http://bugs.php.net/fix.php?id=17616&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=17616&r=support Expected behavior: http://bugs.php.net/fix.php?id=17616&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=17616&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=17616&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=17616&r=globals