Merge pull request #3678 from arcturial/regex-named-group-fix

Add the P character to the regex pattern

src/Composer/Package/Version/VersionParser.php

@@ -178,7 +178,7 @@ class VersionParser
      */
     public function parseNumericAliasPrefix($branch)
     {
-        if (preg_match('/^(?<version>(\d+\\.)*\d+)(?:\.x)?-dev$/i', $branch, $matches)) {
+        if (preg_match('/^(?P<version>(\d+\\.)*\d+)(?:\.x)?-dev$/i', $branch, $matches)) {
             return $matches['version'].".";
         }