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PiperOrigin-RevId: 648468966
diff --git a/doc/overview.md b/doc/overview.md
index c277e87..deed553 100644
--- a/doc/overview.md
+++ b/doc/overview.md
@@ -24,7 +24,7 @@
   EXPECT_THAT(output, Optional(Eq(number)));
 }
 FUZZ_TEST(ParseLeadingDigitsTest, ParsesIntCorrectly)
-  .WithDomains(/*number=*/Arbitrary<int>(), /*suffix=*/InRegexp("^[0-9].*"));
+  .WithDomains(/*number=*/Arbitrary<int>(), /*suffix=*/InRegexp("^\D.*"));
 ```
 
 In the fuzz test version of the above test, `ParsesIntCorrectly` runs