Sjoerd Meijer 36a8b8ed10 [FileCheck] regexp doc update/fix
Minor doc update that the FileCheck matcher supports POSIX ERE.
It also fixes a minor issue in the regexp describing a variable
name: underscores are allowed too.

Differential Revision: https://reviews.llvm.org/D38787

llvm-svn: 315679
2017-10-13 14:02:36 +00:00
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