Fix a regression when running with Centipede.

PiperOrigin-RevId: 598854924

e2e_tests/functional_test.cc

diff --git a/e2e_tests/functional_test.cc b/e2e_tests/functional_test.cc
index 6a9f534..2214b4c 100644
--- a/e2e_tests/functional_test.cc
+++ b/e2e_tests/functional_test.cc
@@ -1406,7 +1406,7 @@
 
 TEST_P(FuzzingModeCrashFindingTest, ProtoTestFindsAbortInFuzzingMode) {
   auto [status, std_out, std_err] = Run("MySuite.Proto");
-  EXPECT_THAT(std_err, ContainsRegex(R"(argument 0: \((.*\n)?b:\s+true)"));
+  EXPECT_THAT(std_err, ContainsRegex(R"(argument 0: \((.*\n.*)?b:\s+true)"));
   ExpectTargetAbort(status, std_err);
 }