From 3585dfd9bd84005ba20e4a97802dea13fb82c63e Mon Sep 17 00:00:00 2001
From: Reto Kromer <retokromer@users.noreply.github.com>
Date: Sun, 23 Apr 2017 20:59:02 +0200
Subject: [PATCH] remove inner group

---
 Library/Homebrew/version.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/version.rb b/Library/Homebrew/version.rb
index 323af46f5e..56ef37f72d 100644
--- a/Library/Homebrew/version.rb
+++ b/Library/Homebrew/version.rb
@@ -346,7 +346,7 @@ class Version
 
     # date-based versioning
     # e.g. ltopers-v2017-04-14.tar.gz
-    m = /-v?(?:\d{4}-\d{2}-\d{2})/.match(stem)
+    m = /-v?(\d{4}-\d{2}-\d{2})/.match(stem)
     return m.captures.first unless m.nil?
 
     # e.g. lame-398-1