ojasvajain commented on code in PR #23696:
URL: https://github.com/apache/kafka/pull/23696#discussion_r4258170130


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server/src/main/java/org/apache/kafka/server/metrics/ClientMatchPattern.java:
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@@ -0,0 +1,66 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.kafka.server.metrics;
+
+/**
+ * A compiled client-metrics match pattern, backed by RE2/J. java.util.regex 
is supported only as
+ * a deprecated, temporary fallback for patterns that predate RE2/J 
validation. See
+ * {@link #ofLegacy}.
+ * <p>
+ * RE2/J's {@code Pattern} and {@code java.util.regex.Pattern} share no common 
supertype, so this
+ * interface gives both a uniform shape wherever a compiled match pattern is 
stored or evaluated.
+ */
+public interface ClientMatchPattern {
+
+    boolean matches(String input);
+
+    String pattern();

Review Comment:
   Neat, thanks! 



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