Bug #77558 [NEW]: mb_ereg_replace() does not properly handle stray backslashes

From: codes at designsandcodes dot com Operating system: * PHP version: 7.3.1 Package: mbstring related Bug Type: Bug Bug description:mb_ereg_replace() does not properly handle stray backslashes Description: ------------ Pre PHP 7.3, a stray backslash would be passed through in the replacement string, if it wasn't part of a backreference. Now, it gets passed through followed by a null character. Test script: --------------- var_export( mb_ereg_replace( '[\\\\/]', '\\', '/a/short/path' ) ); Expected result: ---------------- '\a\\short\\path' Actual result: -------------- '\\' . "\0" . 'a\\' . "\0" . 'short\\' . "\0" . 'path' -- Edit bug report at https://bugs.php.net/bug.php?id=77558&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=77558&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=77558&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=77558&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=77558&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=77558&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=77558&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=77558&r=needscript Try newer version: https://bugs.php.net/fix.php?id=77558&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=77558&r=support Expected behavior: https://bugs.php.net/fix.php?id=77558&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=77558&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=77558&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=77558&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77558&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=77558&r=dst IIS Stability: https://bugs.php.net/fix.php?id=77558&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=77558&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=77558&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=77558&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=77558&r=mysqlcfg