Regex: Fix travis.yml usage of cxxstd=.

Author: jzmaddock

.travis.yml

@@ -28,7 +28,7 @@ matrix:
 
   include:
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++ CXXSTD=c++03
+      env: TOOLSET=gcc COMPILER=g++ CXXSTD=03
 
     - os: linux
       env: TOOLSET=gcc COMPILER=g++-4.7 CXXSTD=03,11
@@ -187,23 +187,23 @@ matrix:
       osx_image: xcode8.3
 
     - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11
       osx_image: xcode8.2
 
     - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11
       osx_image: xcode8.1
 
     - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11
       osx_image: xcode8.0
 
     - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11
       osx_image: xcode7.3
 
     - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=11
       osx_image: xcode6.4
 
 install: