From 08c12ab7bffaa1b96a3e4f9eee34e155eeec9310 Mon Sep 17 00:00:00 2001
From: Jared Breeden <jared.breeden@gmail.com>
Date: Thu, 16 Jul 2015 15:33:07 -0700
Subject: Don't crash if pattern not found for sub

---
 mrblib/string.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mrblib/string.rb b/mrblib/string.rb
index ee097ad6d..23cf02e97 100644
--- a/mrblib/string.rb
+++ b/mrblib/string.rb
@@ -111,6 +111,7 @@ class String
   def sub(*args, &block)
     if args.size == 2
       pre, post = split(args[0], 2)
+      return self unless post # The sub target wasn't found in the string
       pre + args[1].__sub_replace(pre, args[0], post) + post
     elsif args.size == 1 && block
       split(args[0], 2).join(block.call(args[0]))
-- 
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