Handle possible regexes defensively in NamePatternFilter

Previously, if a name contained part of a regex but wasn't actually
a regex, a PatternSyntaxException would be thrown and the request
would fail.

This commit updates NamePatternFilter to catch PatternSyntaxException
and treat the regex-like input as a name insteead.

See gh-9730

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/mvc/NamePatternFilterTests.java

@@ -27,6 +27,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Phillip Webb
  * @author Andy Wilkinson
+ * @author Dylian Bego
  */
 public class NamePatternFilterTests {
 
@@ -38,6 +39,13 @@ public class NamePatternFilterTests {
 		assertThat(filter.isGetNamesCalled()).isFalse();
 	}
 
+	@Test
+	public void nonRegexThatContainsRegexPart() throws Exception {
+		MockNamePatternFilter filter = new MockNamePatternFilter();
+		assertThat(filter.getResults("*")).containsEntry("*", "*");
+		assertThat(filter.isGetNamesCalled()).isFalse();
+	}
+
 	@Test
 	public void regexRepetitionZeroOrMore() {
 		MockNamePatternFilter filter = new MockNamePatternFilter();