diff --git a/test/lib-test/jdk/test/lib/process/OutputAnalyzerTest.java b/test/lib-test/jdk/test/lib/process/OutputAnalyzerTest.java
index 3426c7daab9..4d916f9b1fa 100644
--- a/test/lib-test/jdk/test/lib/process/OutputAnalyzerTest.java
+++ b/test/lib-test/jdk/test/lib/process/OutputAnalyzerTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2025, 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
@@ -217,6 +217,69 @@ public class OutputAnalyzerTest {
             }
         }
 
+        {
+            // Multi-line output: OutputAnalyzer uses MULTILINE but not DOTALL, so "." doesn't match newline, but
+            // "^" and "$" matches just after or just before, respectively, a newline.
+            stdout = "aaaaaa\nxxxxxx\n";
+            stderr = "bbbbbb\nyyyyyy\n";
+
+            OutputAnalyzer out = new OutputAnalyzer(stdout, stderr);
+
+            out.shouldMatch("aaa");
+            out.shouldMatch("xxx");
+            out.shouldMatch("bbb");
+            out.shouldMatch("yyy");
+
+            out.stdoutShouldMatch("aaaaaa");
+            out.stdoutShouldMatch("xxxxxx");
+            out.stderrShouldMatch("bbbbbb");
+            out.stderrShouldMatch("yyyyyy");
+
+            out.shouldMatch("^aaaaaa$");
+            out.shouldMatch("^xxxxxx$");
+            out.shouldMatch("^bbbbbb$");
+            out.shouldMatch("^yyyyyy$");
+
+            out.stdoutShouldMatch("^aaaaaa$");
+            out.stdoutShouldMatch("^xxxxxx$");
+            out.stderrShouldMatch("^bbbbbb$");
+            out.stderrShouldMatch("^yyyyyy$");
+
+            out.shouldMatch   ("a.*");
+            out.shouldNotMatch("a.*x");
+            out.shouldMatch   ("b.*");
+            out.shouldNotMatch("b.*y");
+            out.stdoutShouldMatch   ("a.*");
+            out.stdoutShouldNotMatch("a.*x");
+            out.stderrShouldMatch   ("b.*");
+            out.stderrShouldNotMatch("b.*y");
+
+            check(out.matches("^aaaaaa$"));
+            check(out.matches("^yyyyyy$"));
+            check(out.stdoutMatches("^aaaaaa$"));
+            check(out.stderrMatches("^yyyyyy$"));
+
+            check( out.matches("a.*"));
+            check(!out.matches("a.*x"));
+
+            check( out.stdoutMatches("a.*"));
+            check(!out.stdoutMatches("a.*x"));
+
+            check( out.stderrMatches("b.*"));
+            check(!out.stderrMatches("b.*y"));
+
+            // Test the "contains" methods as well
+            check(out.contains("aaa\nxxx"));
+            check(out.contains("bbb\nyyy"));
+            check(out.stdoutContains("aaa\nxxx"));
+            check(out.stderrContains("bbb\nyyy"));
+
+            check(!out.contains("X"));
+            check(!out.contains("X"));
+            check(!out.stdoutContains("X"));
+            check(!out.stderrContains("X"));
+        }
+
         {
             try {
                 // Verify the exception message
@@ -244,4 +307,9 @@ public class OutputAnalyzerTest {
         }
     }
 
+    private static void check(boolean b) {
+        if (!b) {
+            throw new RuntimeException("Check failed");
+        }
+    }
 }
diff --git a/test/lib/jdk/test/lib/process/OutputAnalyzer.java b/test/lib/jdk/test/lib/process/OutputAnalyzer.java
index fa5e30dd815..d8b3f470260 100644
--- a/test/lib/jdk/test/lib/process/OutputAnalyzer.java
+++ b/test/lib/jdk/test/lib/process/OutputAnalyzer.java
@@ -354,25 +354,44 @@ public final class OutputAnalyzer {
         return this;
     }
 
+    /**
+     * Returns true if the pattern can be found in the given string(s).
+     *
+     * NOTE: The meaning of "match" in OutputAnalyzer is NOT the same as String.matches().
+     * Rather it means "can the pattern be found in stdout and/or stderr".
+     *
+     * The pattern is comiled with MULTILINE but without DOTALL, so "." doesn't match newline, but
+     * "^" and "$" matches just after or just before, respectively, a newline.
+     */
+    private boolean findPattern(String regexp, String... strings) {
+        Pattern pattern = Pattern.compile(regexp, Pattern.MULTILINE);
+        for (String s : strings) {
+            if (pattern.matcher(s).find()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     /**
      * Returns true if stdout matches the given pattern
      */
     public boolean stdoutMatches(String regexp) {
-        return getStdout().matches(regexp);
+        return findPattern(regexp, getStdout());
     }
 
     /**
      * Returns true if stderr matches the given pattern
      */
     public boolean stderrMatches(String regexp) {
-        return getStderr().matches(regexp);
+        return findPattern(regexp, getStderr());
     }
 
     /**
      * Returns true if either stdout or stderr matches the given pattern
      */
     public boolean matches(String regexp) {
-        return stdoutMatches(regexp) || stderrMatches(regexp);
+        return findPattern(regexp, getStdout(), getStderr());
     }
 
     /**
@@ -383,12 +402,7 @@ public final class OutputAnalyzer {
      * @throws RuntimeException If the pattern was not found
      */
     public OutputAnalyzer shouldMatch(String regexp) {
-        String stdout = getStdout();
-        String stderr = getStderr();
-        Pattern pattern = Pattern.compile(regexp, Pattern.MULTILINE);
-        Matcher stdoutMatcher = pattern.matcher(stdout);
-        Matcher stderrMatcher = pattern.matcher(stderr);
-        if (!stdoutMatcher.find() && !stderrMatcher.find()) {
+        if (!matches(regexp)) {
             reportDiagnosticSummary();
             throw new RuntimeException("'" + regexp
                   + "' missing from stdout/stderr");
@@ -404,9 +418,7 @@ public final class OutputAnalyzer {
      * @throws RuntimeException If the pattern was not found
      */
     public OutputAnalyzer stdoutShouldMatch(String regexp) {
-        String stdout = getStdout();
-        Matcher matcher = Pattern.compile(regexp, Pattern.MULTILINE).matcher(stdout);
-        if (!matcher.find()) {
+        if (!stdoutMatches(regexp)) {
             reportDiagnosticSummary();
             throw new RuntimeException("'" + regexp
                   + "' missing from stdout");
@@ -421,12 +433,10 @@ public final class OutputAnalyzer {
      * @param pattern
      * @throws RuntimeException If the pattern was not found
      */
-    public OutputAnalyzer stderrShouldMatch(String pattern) {
-        String stderr = getStderr();
-        Matcher matcher = Pattern.compile(pattern, Pattern.MULTILINE).matcher(stderr);
-        if (!matcher.find()) {
+    public OutputAnalyzer stderrShouldMatch(String regexp) {
+        if (!stderrMatches(regexp)) {
             reportDiagnosticSummary();
-            throw new RuntimeException("'" + pattern
+            throw new RuntimeException("'" + regexp
                   + "' missing from stderr");
         }
         return this;
@@ -468,9 +478,7 @@ public final class OutputAnalyzer {
      * @throws RuntimeException If the pattern was found
      */
     public OutputAnalyzer stdoutShouldNotMatch(String regexp) {
-        String stdout = getStdout();
-        Matcher matcher = Pattern.compile(regexp, Pattern.MULTILINE).matcher(stdout);
-        if (matcher.find()) {
+        if (stdoutMatches(regexp)) {
             reportDiagnosticSummary();
             throw new RuntimeException("'" + regexp
                     + "' found in stdout");
@@ -486,9 +494,7 @@ public final class OutputAnalyzer {
      * @throws RuntimeException If the pattern was found
      */
     public OutputAnalyzer stderrShouldNotMatch(String regexp) {
-        String stderr = getStderr();
-        Matcher matcher = Pattern.compile(regexp, Pattern.MULTILINE).matcher(stderr);
-        if (matcher.find()) {
+        if (stderrMatches(regexp)) {
             reportDiagnosticSummary();
             throw new RuntimeException("'" + regexp
                     + "' found in stderr");