[clang-tools-extra] [clang-tidy] Add llvm-regex check (PR #207407)

[via cfe-commits]

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@@ -318,6 +318,11 @@ New checks
   Checks for presence or absence of trailing commas in enum definitions and
   initializer lists.
 
+- New :doc:`llvm-regex
+  <clang-tidy/checks/llvm/regex>` check.
+
+  Detects malformed regex patterns used in ``llvm::Regex``.
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EugeneZelenko wrote:

Please synchronize with first statement in documentation.

https://github.com/llvm/llvm-project/pull/207407