Bug #80166 [NEW]: preg_match_all()'s PREG_OFFSET_CAPTURE ignoring modifier u

From: thomas at landauer dot at Operating system: Linux PHP version: 7.2.33 Package: PCRE related Bug Type: Bug Bug description:preg_match_all()'s PREG_OFFSET_CAPTURE ignoring modifier u Description: ------------ PREG_OFFSET_CAPTURE always counts utf-8 special characters as *2* (bytes) - no matter if the modifier u (PCRE_UTF8) is present or not. This has been reported before at https://bugs.php.net/bug.php?id=37391 but got closed as "Not a bug". However, taking a look at the documentation clearly shows that this *is* a bug: https://www.php.net/manual/en/function.preg-match-all.php#refsect1-function.preg-match-all-parameters says about PREG_OFFSET_CAPTURE > If this flag is passed, for every occurring match the appendant string offset will also be returned. "string offset" obviously refers to the number of *characters* in front of the match. And https://www.php.net/manual/en/reference.pcre.pattern.modifiers.php says about u (PCRE_UTF8): > Pattern and subject strings are treated as UTF-8. My actual PHP version is 7.2.24 Test script: --------------- preg_match_all('/a/u', 'öa', $matches, PREG_OFFSET_CAPTURE); var_dump($matches); Expected result: ---------------- [1]=>int(1) Actual result: -------------- [1]=>int(2) (=expected result without modifier u) -- Edit bug report at https://bugs.php.net/bug.php?id=80166&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=80166&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=80166&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=80166&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=80166&r=needscript Try newer version: https://bugs.php.net/fix.php?id=80166&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=80166&r=support Expected behavior: https://bugs.php.net/fix.php?id=80166&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=80166&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=80166&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=80166&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=80166&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=80166&r=dst IIS Stability: https://bugs.php.net/fix.php?id=80166&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=80166&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=80166&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=80166&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=80166&r=mysqlcfg