From 318055b811e1578027431a31ecaadd7c8fb6177f Mon Sep 17 00:00:00 2001
From: Masashi Fujita <objectxtreme@gmail.com>
Date: Mon, 4 Dec 2017 02:42:34 +0900
Subject: [PATCH] =?UTF-8?q?`|`=20should=20be=20inside=20of=20`(=E2=80=A6)`?=
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It's possible to use `(t|true|T|True)` as `truthy_pattern` but still failing `true` as a truthy under my environment :-(

```
Apple LLVM version 8.0.0 (clang-800.0.42.1)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
```

\# clang-5.0.0 works as expected even if does not modify it.
---
 include/cxxopts.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/cxxopts.hpp b/include/cxxopts.hpp
index 49ade40..5068e67 100644
--- a/include/cxxopts.hpp
+++ b/include/cxxopts.hpp
@@ -444,7 +444,7 @@ namespace cxxopts
       std::basic_regex<char> integer_pattern
         ("(-)?(0x)?([1-9a-zA-Z][0-9a-zA-Z]*)|((0x)?0)");
       std::basic_regex<char> truthy_pattern
-        ("t|true|T|True");
+        ("(t|T)(rue)?");
       std::basic_regex<char> falsy_pattern
         ("(f|false|F|False)?");
     }