Fixed detection of hg version when localized, fixes #9753

CHANGELOG.md

@@ -1,13 +1,14 @@
 ### [2.0.12] 2021-04-01
 
   * Fixed support for new GitHub OAuth token format (#9757)
-  * Fixed support for Vagrant/VirtualBox filesystem slowness by adding short sleeps in some places (#9627) 
+  * Fixed support for Vagrant/VirtualBox filesystem slowness by adding short sleeps in some places (#9627)
   * Fixed unclear error reporting when a package is in the lock file but not in the remote repositories (#9750)
   * Fixed processes silently ignoring the CWD when it does not exist
   * Fixed new Windows bin handling to avoid proxying phar files (#9742)
   * 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];
             }
         }