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

[via cfe-commits]

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@@ -0,0 +1,37 @@
+# clang-tidy - llvm-invalid-regex-pattern
+
+## llvm-invalid-regex-pattern
+
+Detects malformed regex patterns defined in a single string literal
+to catch mistakes at compile time.
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furtib wrote:

Removed "to catch mistakes at compile time".

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