* @return the parsed charset name, or null if not found
     */
    protected String parseCharset(final String content) {
        final Pattern pattern = Pattern.compile("; *charset *= *([a-zA-Z0-9\\-_]+)", Pattern.CASE_INSENSITIVE);
        final Matcher matcher = pattern.matcher(content);
        if (matcher.find()) {
            return matcher.group(1);
        }
        return null;
    }

    /**

You can define a <abbr title="A regular expression, regex or regexp is a sequence of characters that define a search pattern for strings.">regular expression</abbr> `pattern` that the parameter should match:

{* ../../docs_src/query_params_str_validations/tutorial004_an_py310.py hl[11] *}

This specific regular expression pattern checks that the received parameter value:

* `^`: starts with the following characters, doesn't have characters before.

    /**
     * Converts to {@link BigDecimal}.
     *
     * @param o
     *            The object to convert
     * @param pattern
     *            The pattern string
     * @return The converted {@link BigDecimal}
     */
    public static BigDecimal toBigDecimal(final Object o, final String pattern) {
        if (o == null) {
            return null;
        } else if (o instanceof BigDecimal) {
            return (BigDecimal) o;

	<Appenders>
		<RollingFile name="AppFile" fileName="${log.file.basedir}/${domain.name}.log"
			filePattern="${log.file.basedir}/${domain.name}${backup.date.suffix}-%i.log.gz">
			<PatternLayout><Pattern>${log.pattern}</Pattern></PatternLayout><!-- <EcsLayout serviceName="fess" eventDataset="suggest" /> -->
			<Policies>
				<TimeBasedTriggeringPolicy />
				<SizeBasedTriggeringPolicy size="100 MB" />
			</Policies>

	<Appenders>
		<RollingFile name="AppFile" fileName="${log.file.basedir}/${domain.name}.log"
			filePattern="${log.file.basedir}/${domain.name}${backup.date.suffix}-%i.log.gz">
			<PatternLayout><Pattern>${log.pattern}</Pattern></PatternLayout><!-- <EcsLayout serviceName="fess" eventDataset="thumbnail" /> -->
			<Policies>
				<TimeBasedTriggeringPolicy />
				<SizeBasedTriggeringPolicy size="100 MB" />
			</Policies>

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.opensearch.config.exbhv;

import java.util.regex.Pattern;

import org.codelibs.fess.opensearch.config.bsbhv.BsCrawlingInfoParamBhv;
import org.codelibs.fess.util.ComponentUtil;

/**
 * @author FreeGen
 */

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.opensearch.config.exbhv;

import java.util.regex.Pattern;

import org.codelibs.fess.opensearch.config.bsbhv.BsElevateWordBhv;
import org.codelibs.fess.util.ComponentUtil;

/**
 * @author FreeGen
 */
public class ElevateWordBhv extends BsElevateWordBhv {

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.opensearch.config.exbhv;

import java.util.regex.Pattern;

import org.codelibs.fess.opensearch.config.bsbhv.BsKeyMatchBhv;
import org.codelibs.fess.util.ComponentUtil;

/**
 * @author FreeGen
 */
public class KeyMatchBhv extends BsKeyMatchBhv {

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.opensearch.config.exbhv;

import java.util.regex.Pattern;

import org.codelibs.fess.opensearch.config.bsbhv.BsLabelTypeBhv;
import org.codelibs.fess.util.ComponentUtil;

/**
 * @author FreeGen
 */
public class LabelTypeBhv extends BsLabelTypeBhv {

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.opensearch.config.exbhv;

import java.util.regex.Pattern;

import org.codelibs.fess.opensearch.config.bsbhv.BsRelatedQueryBhv;
import org.codelibs.fess.util.ComponentUtil;

/**
 * @author FreeGen
 */
public class RelatedQueryBhv extends BsRelatedQueryBhv {