* - Uppercase letters (A-Z)
     * - Digits (0-9)
     * - Special characters: . - * _ : / + % = & ? # [ ] @ ~ ! $ ' ( ) , ;
     *
     * @param c the character to check
     * @return {@code true} if the character is a valid URL character, {@code false} otherwise
     */
    public static boolean isUrlChar(final char c) {
        if (c >= 'a' && c <= 'z' //
                || c >= 'A' && c <= 'Z' //
                || c >= '0' && c <= '9' //

     * @param cause the cause (which is saved for later retrieval by the {@link #getCause()} method).
     *              (A {@code null} value is permitted, and indicates that the cause is nonexistent or unknown.)
     */
    public ExtractException(final String message, final Throwable cause) {
        super(message, cause);
    }

    /**

/* Test Code */
#include <sdtio.h>


int main(void)
{
    printf("テスト");

        try {
            final XPathNodes list = getXPathAPI().selectNodeList(document, "//BASE");
            if (list.size() > 0) {
                final Node node = list.get(0);
                final Node attrNode = node.getAttributes().getNamedItem("href");
                if (attrNode != null) {
                    String attrValue = attrNode.getNodeValue();

# Build without tests
mvn clean install -DskipTests

# Build specific module
mvn clean install -pl fess-crawler

# Generate test coverage report
mvn jacoco:report
```

### Code Quality

```bash
# Format code
mvn formatter:format

# Update license headers
mvn license:format

# Run static analysis
mvn spotbugs:check
```

### Running Tests

```bash
# Run all tests

 *
 * <p>Constants:</p>
 * <ul>
 *   <li>{@code ELEVATE_WORD_SETTINGD_KEY} - The key for elevate word settings.</li>
 *   <li>{@code ELEVATE_WORD_BOOST} - The key for elevate word boost value.</li>
 *   <li>{@code ELEVATE_WORD_READING} - The key for elevate word readings.</li>
 *   <li>{@code ELEVATE_WORD_FIELDS} - The key for elevate word fields.</li>
 *   <li>{@code ELEVATE_WORD_TAGS} - The key for elevate word tags.</li>

    /**
     * The status code for OK.
     */
    public static final int OK_STATUS = 0;

    /**
     * The status code for Not Modified.
     */
    public static final int NOT_MODIFIED_STATUS = 304;

    /**
     * The HTTP status code for OK.
     */
    public static final int OK_STATUS_CODE = 200;

    /**
     * The HTTP status code for Not Modified.
     */

        if (successfulHttpCodes == null) {
            return true;
        }
        final int httpStatusCode = responseData.getHttpStatusCode();
        for (final int code : successfulHttpCodes) {
            if (code == httpStatusCode) {
                return true;
            }
        }
        return false;
    }

    /**

            return minioClient.statObject(args);
        } catch (final ErrorResponseException e) {
            final String code = e.errorResponse().code();
            switch (code) {
            case "NoSuchBucket":
                throw new CrawlingAccessException("Bucket " + bucketName + " is not found.", e);
            case "NoSuchKey", "NoSuchObject":

    <_comment>Lua source code</_comment>
    <glob pattern="*.lua"/>
    <sub-class-of type="text/plain"/>
  </mime-type>

  <mime-type type="text/x-ml">
    <_comment>ML source code</_comment>
    <glob pattern="*.ml"/>
    <sub-class-of type="text/plain"/>
  </mime-type>

  <mime-type type="text/x-matlab">
    <_comment>Matlab source code</_comment>