[C#] Replace regex that validates descriptor names (#12174)
This PR replaces the descriptor name validation regex with a validation method. This change allows the `System.Text.RegularExpressions` engine to be trimmed away in published apps that do standard protobuf serialization.
There are some other usages of `Regex` in Google.Protobuf, but they in `JsonParser`. They are only included in a published app if `JsonParser` is used.
Another benefit is a slightly faster app startup time. The removed regex was compiled, which has a high-ish fixed cost.
cc @jskeet @jtattermusch
Closes #12174
COPYBARA_INTEGRATE_REVIEW=https://github.com/protocolbuffers/protobuf/pull/12174 from JamesNK:jamesnk/remove-regex 9d065a3a717bed180a2a3c91e72826f5fe405cff
PiperOrigin-RevId: 532210203
diff --git a/objectivec/GPBAny.pbobjc.h b/objectivec/GPBAny.pbobjc.h
index f4efbb2..c0d389f 100644
--- a/objectivec/GPBAny.pbobjc.h
+++ b/objectivec/GPBAny.pbobjc.h
@@ -157,7 +157,8 @@
*
* Note: this functionality is not currently available in the official
* protobuf release, and it is not used for type URLs beginning with
- * type.googleapis.com.
+ * type.googleapis.com. As of May 2023, there are no widely used type server
+ * implementations and no plans to implement one.
*
* Schemes other than `http`, `https` (or the empty scheme) might be
* used with implementation specific semantics.
