* Avoid to compile bad or false regex

Author: DylianBEGO

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/mvc/NamePatternFilter.java

@@ -31,11 +31,12 @@
  * @author Phillip Webb
  * @author Sergei Egorov
  * @author Andy Wilkinson
+ * @author Dylian Bego
  * @since 1.3.0
  */
 abstract class NamePatternFilter<T> {
 
-	private static final String[] REGEX_PARTS = { "*", "$", "^", "+", "[" };
+	private static final String[] REGEX_PARTS = { "*", "$", "^", "+", "["};
 
 	private final T source;
 
@@ -44,27 +45,31 @@ abstract class NamePatternFilter<T> {
 	}
 
 	public Map<String, Object> getResults(String name) {
-		if (!isRegex(name)) {
+		Pattern pattern = getRegexPattern(name);
+		if (pattern == null) { // this is not a regex
 			Object value = getValue(this.source, name);
 			Map<String, Object> result = new HashMap<>();
 			result.put(name, value);
 			return result;
 		}
-		Pattern pattern = Pattern.compile(name);
 		ResultCollectingNameCallback resultCollector = new ResultCollectingNameCallback(
 				pattern);
 		getNames(this.source, resultCollector);
 		return resultCollector.getResults();
 
 	}
 
-	private boolean isRegex(String name) {
+	private Pattern getRegexPattern(String name) {
 		for (String part : REGEX_PARTS) {
 			if (name.contains(part)) {
-				return true;
+				try {
+					return Pattern.compile(name);
+				} catch(RuntimeException re){
+					return null;
+				}
 			}
 		}
-		return false;
+		return null;
 	}
 
 	protected abstract void getNames(T source, NameCallback callback);

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

@@ -27,6 +27,7 @@
  *
  * @author Phillip Webb
  * @author Andy Wilkinson
+ * @author Dylian Bego
  */
 public class NamePatternFilterTests {
 
@@ -37,6 +38,13 @@ public void nonRegex() throws Exception {
 				"not.a.regex");
 		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() {