Add support for re2

README.rst

@@ -38,6 +38,7 @@ Why choose this library?
 - Tolerant of many common errors found in real-world SRT files
 - Completely Unicode compliant
 - `Released into the public domain`_
+- Optional support for highly performant `re2`_ regex engine
 - Real world tested — used in production to process thousands of SRT files
   every day
 - Portable — runs on Linux, OSX, and Windows

srt.py

@@ -4,10 +4,13 @@
 
 from __future__ import unicode_literals
 import functools
-import re
 from datetime import timedelta
 import logging
 
+try:  # Optional performance boost
+    import re2 as re
+except ImportError:
+    import re
 
 log = logging.getLogger(__name__)