[clang-tools-extra] [clang-tidy] Avoid replacing match_results length() with empty() (PR #234905)

[via cfe-commits]

================
@@ -1090,3 +1091,55 @@ bool testDependentValidContainer(TemplatedContainer<T> 
c) {
 }
 template bool testDependentValidContainer<int>(TemplatedContainer<int>);
 }
+
+void testRegexMatchResults() {
+  std::smatch sm;
----------------
MitraGulla wrote:

I added tests covering both `using` aliases and `typedef` aliases of 
`std::smatch`.

https://github.com/llvm/llvm-project/pull/234905
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