Louis Dionne 6ba2d7b166 [libc++] Fixes backreferences for extended grammar.
The regex backreferences were not properly parsed and used when using
the extended grammar. This change parses them. The issue was found while
working on PR34297.

Thanks to Mark de Wever for the patch!

Differential Revision: https://reviews.llvm.org/D62451
2020-02-19 15:57:16 -05:00
..
2019-02-04 20:31:13 +00:00