ignatov · March 31, 2019 18:07 · Mar 31, 2019
diff --git a/MatcherTest.java b/MatcherTest.java
@@ -0,0 +1,44 @@
+import java.security.SecureRandom;
+import java.util.regex.Pattern;
+
+public class MatcherTest {
+  private static final String ALPHABET = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_";
+  private static final SecureRandom RANDOM = new SecureRandom();
+
+  private static String generate(int count) {
+    StringBuilder sb = new StringBuilder();
+    for (int i = 0; i < count; ++i) {
+      sb.append(ALPHABET.charAt(RANDOM.nextInt(ALPHABET.length())));
+    }
+    return sb.toString();
+  }
+
+  public static void main(String[] args) {
+    String text = generate(20_000_000);
+
+    long load = System.currentTimeMillis();
+    single(text);
+    System.out.println("composite " + (System.currentTimeMillis() - load));
+
+    long load2 = System.currentTimeMillis();
+    two(text);
+    System.out.println("separate  " + (System.currentTimeMillis() - load2));
+
+  }
+
+  private static void single(String text) {
+    Pattern pattern = Pattern.compile("\\b(todo|fixme)\\b.*");
+    for (int i = 0; i < 20; i++) {
+      pattern.matcher(text).find();
+    }
+  }
+
+  private static void two(String text) {
+    Pattern todo = Pattern.compile("\\btodo\\b.*");
+    Pattern fixme = Pattern.compile("\\bfixme\\b.*");
+    for (int i = 0; i < 20; i++) {
+      fixme.matcher(text).find();
+      todo.matcher(text).find();
+    }
+  }
+}