Fix platform package regex

src/Composer/Repository/PlatformRepository.php

@@ -24,7 +24,7 @@ use Composer\XdebugHandler\XdebugHandler;
  */
 class PlatformRepository extends ArrayRepository
 {
-    const PLATFORM_PACKAGE_REGEX = '{^(?:php(?:-64bit|-ipv6|-zts|-debug)?|hhvm|(?:ext|lib)-[a-z0-9](?:-?[a-z0-9]+)*)$}iD';
+    const PLATFORM_PACKAGE_REGEX = '{^(?:php(?:-64bit|-ipv6|-zts|-debug)?|hhvm|(?:ext|lib)-[a-z0-9](?:[_.-]?[a-z0-9]+)*)$}iD';
 
     private $versionParser;