*
     * @param pattern a <a href="../util/Formatter.html#syntax">format string</a>
     * @param args arguments referenced by the format specifiers in the format string
     * @return the current builder
     */
    @Nonnull
    default MessageBuilder format(String pattern, Object... args) {
        return append(String.format(pattern, args));
    }

    /**
     * Set the buffer length.

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

import java.util.regex.Pattern;

import org.codelibs.fess.es.config.bsbhv.BsBoostDocumentRuleBhv;
import org.codelibs.fess.util.ComponentUtil;

/**
 * @author FreeGen
 */
public class BoostDocumentRuleBhv extends BsBoostDocumentRuleBhv {

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

import java.util.regex.Pattern;

import org.codelibs.fess.es.config.bsbhv.BsCrawlingInfoBhv;
import org.codelibs.fess.util.ComponentUtil;

/**
 * @author FreeGen
 */
public class CrawlingInfoBhv extends BsCrawlingInfoBhv {

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

import java.util.regex.Pattern;

import org.codelibs.fess.es.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.es.config.exbhv;

import java.util.regex.Pattern;

import org.codelibs.fess.es.config.bsbhv.BsJobLogBhv;
import org.codelibs.fess.util.ComponentUtil;

/**
 * @author FreeGen
 */
public class JobLogBhv extends BsJobLogBhv {

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

import java.util.regex.Pattern;

import org.codelibs.fess.es.config.bsbhv.BsRelatedContentBhv;
import org.codelibs.fess.util.ComponentUtil;

/**
 * @author FreeGen
 */
public class RelatedContentBhv extends BsRelatedContentBhv {

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

import java.util.regex.Pattern;

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

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

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

import java.util.regex.Pattern;

import org.codelibs.fess.es.config.bsbhv.BsWebConfigBhv;
import org.codelibs.fess.util.ComponentUtil;

/**
 * @author FreeGen
 */
public class WebConfigBhv extends BsWebConfigBhv {

```

////

## Add regular expressions

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:

//// tab | Python 3.10+

```Python hl_lines="11"
{!> ../../docs_src/query_params_str_validations/tutorial004_an_py310.py!}
```

////

client or server to have an empty Content-Length header.
This behavior is controlled by the `httplaxcontentlength` setting.

Go 1.22 changed the behavior of ServeMux to accept extended
patterns and unescape both patterns and request paths by segment.
This behavior can be controlled by the
[`httpmuxgo121` setting](/pkg/net/http/#ServeMux).

Go 1.22 added the [Alias type](/pkg/go/types#Alias) to [go/types](/pkg/go/types)