Valid grep regex misses

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Search for an IP address then pipe it to a grep transform searching for a 
forward slash. For example: '172.16.0.1 | grep(.,\/21)' should fire /21, which 
is a port in an unparsed Cisco ASA log.
2. ???
3. Profit!

What is the expected output? What do you see instead?

I expect a match only on logs with '/21' Instead, I get those and others (e.g. 
/22)

What version of the product are you using? On what operating system?
Sphinx  Sphinx 2.2.4-id64-dev (r4740)
Date     2014-06-10 17:05:27 -0500 (Tue, 10 Jun 2014)
Author   mcholste
Rev  1204

Please provide any additional information below.

Original issue reported on code.google.com by lib...@gmail.com on 1 Jul 2014 at 3:45