[llvm-commits] PATCH: add backreference support to Regex

[Eli Bendersky]

Hello,

This is the the second patch (*) on the way to implement the FileCheck
enhancement described here:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-November/055840.html

It adds backreference matching capabilities to Support/Regex, with
appropriate unit tests. This change in itself is not expected to
affect any functionality at this point, but it will serve as a
stepping stone to improve FileCheck's variable matching capabilities.

Notes:

1. I had to insert tabs in regcomp.c to preserve existing formatting
2. Support for BREs was added to Regex - but it's easy to remove if
it's not required
3. I documented the addition in the comment at the top of Regex.h, I
don't think we have a non-code document for regex capabilities, please
correct me if I'm wrong.

Eli

(*) The first is r168588 - rewrite the single existing test actually
using the current capability.
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