// Test that MIME type patterns work correctly as regex
        // This verifies the fix for SVG thumbnail generation issue
        // where image/svg+xml was not matching due to unescaped + character

        // SVG MIME type - the + must be escaped in regex
        String svgMimetype = "image/svg+xml";
        String svgPatternWrong = "image/svg+xml"; // Wrong: + means "one or more" in regex

          destIndex += charsSkipped;
        }
        if (escaped.length > 0) {
          System.arraycopy(escaped, 0, dest, destIndex, escaped.length);
          destIndex += escaped.length;
        }
        // If we dealt with an escaped character, reset the unescaped range.
        unescapedChunkStart = nextIndex;
      }
      index = nextEscapeIndex(s, nextIndex, end);
    }

    try {
      e.escape((String) null);
      fail("Escaping null string should throw exception");
    } catch (NullPointerException x) {
      // pass
    }

    // All URL escapers should leave 0-9, A-Z, a-z unescaped
    assertUnescaped(e, 'a');
    assertUnescaped(e, 'z');
    assertUnescaped(e, 'A');
    assertUnescaped(e, 'Z');
    assertUnescaped(e, '0');
    assertUnescaped(e, '9');

            // Create proper escaped pattern
            String escapedPattern = mimeType.replace("+", "\\+");

            // Verify escaped pattern matches
            assertTrue("Escaped pattern should match: " + mimeType, Pattern.compile(escapedPattern).matcher(mimeType).matches());

            // Verify unescaped pattern does NOT match

private fun Buffer.startsWith(prefix: Byte): Boolean = !exhausted() && this[0] == prefix

/**
 * Reads a double-quoted string, unescaping quoted pairs like `\"` to the 2nd character in each
 * sequence. Returns the unescaped string, or null if the buffer isn't prefixed with a
 * double-quoted string.
 */
@Throws(EOFException::class)
private fun Buffer.readQuotedString(): String? {
  require(readByte() == '\"'.code.toByte())

    try {
      e.escape((String) null);
      fail("Escaping null string should throw exception");
    } catch (NullPointerException x) {
      // pass
    }

    // All URL escapers should leave 0-9, A-Z, a-z unescaped
    assertUnescaped(e, 'a');
    assertUnescaped(e, 'z');
    assertUnescaped(e, 'A');
    assertUnescaped(e, 'Z');
    assertUnescaped(e, '0');
    assertUnescaped(e, '9');

    assertThat(spaceEscaper.escape("string with spaces")).isEqualTo("string with spaces");
  }

  /** Tests that if we add extra 'safe' characters they remain unescaped */
  public void testCustomEscaper() {
    UnicodeEscaper e = new PercentEscaper("+*/-", false);
    for (char c = 0; c < 128; c++) {
      if ((c >= '0' && c <= '9')
          || (c >= 'a' && c <= 'z')

    assertThat(spaceEscaper.escape("string with spaces")).isEqualTo("string with spaces");
  }

  /** Tests that if we add extra 'safe' characters they remain unescaped */
  public void testCustomEscaper() {
    UnicodeEscaper e = new PercentEscaper("+*/-", false);
    for (char c = 0; c < 128; c++) {
      if ((c >= '0' && c <= '9')
          || (c >= 'a' && c <= 'z')

});
```

### Text Processing and JSON
```java
import org.codelibs.core.text.*;

// JSON utilities with proper escaping
String escaped = JsonUtil.escape("Hello \"World\" with special chars");
String unescaped = JsonUtil.unescape(escaped);

// Text tokenization
Tokenizer tokenizer = new Tokenizer("field1,field2,field3", ",");
while (tokenizer.hasMoreTokens()) {

	if !compareSignatureV2(signature, calculateSignatureV2(policy, cred.SecretKey)) {
		return cred, ErrSignatureDoesNotMatch
	}
	return cred, ErrNone
}

// Escape encodedQuery string into unescaped list of query params, returns error
// if any while unescaping the values.
func unescapeQueries(encodedQuery string) (unescapedQueries []string, err error) {
	for query := range strings.SplitSeq(encodedQuery, "&") {