fix: Allow underscores in EventRegex (#13861) (#13863)

(cherry picked from commit 14c582f)

Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com>

CHANGELOG.md

@@ -186,7 +186,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (x/gov) [#13045](https://github.com/cosmos/cosmos-sdk/pull/13045) Fix gov migrations for v3(0.46).
 * (snapshot) [#13400](https://github.com/cosmos/cosmos-sdk/pull/13400) Fix snapshot checksum issue in golang 1.19.
 * (x/gov) [#13728](https://github.com/cosmos/cosmos-sdk/pull/13728) Fix propagation of message events to the current context in `EndBlocker`.
-* (server) [#13778](https://github.com/cosmos/cosmos-sdk/pull/13778) Set Cosmos SDK default endpoints to localhost to avoid unknown exposure of endpoints. 
+* (server) [#13778](https://github.com/cosmos/cosmos-sdk/pull/13778) Set Cosmos SDK default endpoints to localhost to avoid unknown exposure of endpoints.
+* [#13861](https://github.com/cosmos/cosmos-sdk/pull/13861) Allow `_` characters in tx event queries, i.e. `GetTxsEvent`.
 
 ### Deprecated
 

tests/e2e/tx/service_test.go

@@ -161,6 +161,11 @@ func TestEventRegex(t *testing.T) {
 			event: "tx.message='something'",
 			match: true,
 		},
+		{
+			name:  "valid: with underscores",
+			event: "claim_reward.message_action='something'",
+			match: true,
+		},
 		{
 			name:  "valid: no quotes",
 			event: "tx.message=something",

x/auth/tx/service.go

@@ -44,7 +44,7 @@ var (
 	_ txtypes.ServiceServer = txServer{}
 
 	// EventRegex checks that an event string is formatted with {alphabetic}.{alphabetic}={value}
-	EventRegex = regexp.MustCompile(`^[a-zA-Z]+\.[a-zA-Z]+=\S+$`)
+	EventRegex = regexp.MustCompile(`^[a-zA-Z_]+\.[a-zA-Z_]+=\S+$`)
 )
 
 const (