[security] Match ${aws:username} exactly instead of prefix match (#7791)

    This PR fixes a security issue where an IAM user based
    on his policy is granted more privileges than restricted
    by the users IAM policy.

    This is due to an issue of prefix based Matcher() function
    which was incorrectly matching prefix based on resource
    prefixes instead of exact match.
```

 *    prefix at all (`publicobject.com`). For most applications this is the best way to configure
 *    certificate pinning.
 *
 *  * **Exactly one subdomain**: Use a single asterisk like `*.publicobject.com` to match exactly
 *    one prefix (`www.publicobject.com`, `api.publicobject.com`). Be careful with this approach as

        System.setProperty("java.version", "11.0.1");

        String[] args = new String[] { "8:-Xmx1g", // Exact Java 8
                "11:-Xmx2g", // Exact Java 11
                "17:-Xmx4g", // Exact Java 17
                "11:-XX:+UseG1GC" // Another exact Java 11
        };

        String[] result = JvmUtil.filterJvmOptions(args);
        assertEquals(2, result.length);

# code.
#
# https://github.com/kubernetes/test-infra/blob/master/prow/plugins/size/size.go
#
# This file is a series of lines, each of the form:
#     <type> <name>
#
# Type can be:
#    path - an exact path to a single file
#    file-name - an exact leaf filename, regardless of path
#    path-prefix - a prefix match on the file path
#    file-prefix - a prefix match of the leaf filename (no path)

        // Given - notification exactly at buffer end
        byte[] buffer = new byte[104]; // Exact size needed
        int offset = 0;

        setHeaderStart(response, 64);

        // Write structure
        SMBUtil.writeInt2(9, buffer, offset);
        SMBUtil.writeInt2(80 - 64, buffer, offset + 2);
        SMBUtil.writeInt4(24, buffer, offset + 4); // Exact notification size

        // Write notification

        assertEquals(0, validator.safeMultiply(0, Integer.MAX_VALUE));
        assertEquals(1, validator.safeMultiply(1, 1));

        // Test exact buffer boundaries
        byte[] buffer = new byte[100];
        validator.validateBufferAccess(buffer, 0, 100); // Exactly full buffer
        validator.validateBufferAccess(buffer, 100, 0); // Zero length at end
    }

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/**
 * Helper class for managing related content configurations.
 * This class provides functionality to load, cache, and retrieve related content
 * based on search queries and virtual host configurations. It supports both exact
 * term matching and regex pattern matching for flexible content association.
 */
public class RelatedContentHelper extends AbstractConfigHelper {

    /**
     * Default constructor for RelatedContentHelper.

    return construct(array);
  }

  /**
   * Returns an immutable list containing the given elements, in order. If {@code elements} is a
   * {@link Collection}, this method behaves exactly as {@link #copyOf(Collection)}; otherwise, it
   * behaves exactly as {@code copyOf(elements.iterator()}.
   *
   * @throws NullPointerException if {@code elements} contains a null element
   */

        testData.add(createRelatedContent("exact", "Exact Match", ""));
        testData.add(createRelatedContent("regex:test.*", "Regex Match: __QUERY__", ""));
        mockBhv.setTestData(testData);

        relatedContentHelper.load();

        // Test exact match
        String[] results = relatedContentHelper.getRelatedContents("exact");
        assertEquals(1, results.length);