Fixed detection of hg version when localized, fixes #9753

CHANGELOG.md

@@ -8,6 +8,7 @@
   * Fixed issue extracting archives into paths that already exist, fixing problems with some custom installers (composer/installers#479)
   * Fixed support for branch names starting with master/trunk/default (#9739)
   * Fixed self-update to preserve phar file permissions on Windows (#9733)
+  * Fixed detection of hg version when localized (#9753)
   * Fixed git execution failures to also include the stdout output (#9720)
 
 ### [2.0.11] 2021-02-24

src/Composer/Util/Hg.php

@@ -92,7 +92,7 @@ class Hg
     {
         if (false === self::$version) {
             self::$version = null;
-            if (0 === $process->execute('hg --version', $output) && preg_match('/version (\d+(?:\.\d+)+)/m', $output, $matches)) {
+            if (0 === $process->execute('hg --version', $output) && preg_match('/^.+? (\d+(?:\.\d+)+)\)?\r?\n/', $output, $matches)) {
                 self::$version = $matches[1];
             }
         }