```
@Target(value={METHOD,FIELD,ANNOTATION_TYPE,CONSTRUCTOR,PARAMETER})
 @Retention(value=RUNTIME)
 @Documented
 @Constraint(validatedBy={})
public @interface Pattern
```
The annotated CharSequence must match the specified regular expression. The regular expression follows the Java regular expression conventions see Pattern.
Accepts CharSequence. null elements are considered valid.

Author:

Emmanuel Bernard

- Required Element Summary
  
  Required Elements
  Modifier and Type Required Element and Description
  
  String regexp
  
  Pattern (Java(TM) EE 7 Specification APIs) Home of API Java Contents Haut
- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element and Description
  
  Pattern.Flag[] flags
  
  Class<?>[] groups
  
  String message
  
  Class<? extends Payload>[] payload
  
  Pattern (Java(TM) EE 7 Specification APIs) Home of API Java Contents Haut

- Element Detail
  - regexp
```
public abstract String regexp
```
    Returns:
    
    the regular expression to match
- - flags
```
public abstract Pattern.Flag[] flags
```
    Returns:
    
    array of Flags considered when resolving the regular expression
    
    Default:
    
    {}
- - message
```
public abstract String message
```
    Returns:
    
    the error message template
    
    Default:
    
    "{javax.validation.constraints.Pattern.message}"
- - groups
```
public abstract Class<?>[] groups
```
    Returns:
    
    the groups the constraint belongs to
    
    Default:
    
    {}
- - payload
```
public abstract Class<? extends Payload>[] payload
```
    Returns:
    
    the payload associated to the constraint
    
    Default:
    
    {}

Document created the 11/06/2005, last modified the 18/08/2025
Source of the printed document:https://www.gaudry.be/en/java-api-javaee-rf-javax/validation/constraints/pattern.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

Manuel PHP : https://docs.oracle.com/en/java/, Annotation Type Pattern

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author of this site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Modifier and Type	Optional Element and Description
`Pattern.Flag[]`	`flags`
`Class<?>[]`	`groups`
`String`	`message`
`Class<? extends Payload>[]`	`payload`

Annotation Type Pattern

Required Element Summary

Optional Element Summary

Element Detail

regexp

flags

message

groups

payload

References