--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/micro/org/openjdk/bench/java/util/regex/PatternBench.java	Sat Jun 01 03:18:23 2019 +0200
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.openjdk.bench.java.util.regex;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Measurement;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.Warmup;
+
+import java.util.concurrent.TimeUnit;
+import java.util.regex.Pattern;
+import java.util.regex.PatternSyntaxException;
+
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+@State(Scope.Thread)
+public class PatternBench {
+
+    public String fileTestString;
+    public String flagsString;
+
+
+    public Pattern graphemePattern;
+    public Pattern jmodPattern;
+    public Pattern jmodCanonicalPattern;
+
+    public Pattern pattern;
+
+    @Setup
+    public void setup() {
+        flagsString = "\ud83c\udde6\ud83c\uddec\ud83c\uddec\ud83c\udde6\ud83c\uddfa\ud83c\uddf8\ud83c\uddeb\ud83c\uddf7";
+        fileTestString = "META-INF/providers/org.openjdk.foo_hotspot_nodes_PluginFactory_EndLockScopeNode";
+        graphemePattern = Pattern.compile("\\b{g}");
+
+        String jmodRegex = "^.*(?:(?:_the\\.[^/]*)|(?:_[^/]*\\.marker)|(?:[^/]*\\.diz)|(?:[^/]*\\.debuginfo)|(?:[^/]*\\.dSYM/.*)|(?:[^/]*\\.dSYM)|(?:[^/]*\\.pdb)|(?:[^/]*\\.map))$";
+        jmodCanonicalPattern = Pattern.compile(jmodRegex, Pattern.CANON_EQ);
+        jmodPattern = Pattern.compile(jmodRegex);
+    }
+
+    @Benchmark
+    @Warmup(iterations = 3)
+    @Measurement(iterations = 3)
+    public int splitFlags() {
+        return graphemePattern.split(flagsString).length;
+    }
+
+    @Benchmark
+    @Warmup(iterations = 3)
+    @Measurement(iterations = 3)
+    public boolean canonicalJmodMatch() {
+        return jmodCanonicalPattern.matcher(fileTestString).matches();
+    }
+
+    @Benchmark
+    @Warmup(iterations = 3)
+    @Measurement(iterations = 3)
+    public boolean normalJmodMatch() {
+        return jmodPattern.matcher(fileTestString).matches();
+    }
+}