Pattern

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Summary:
Field |
Required |
Optional

Detail:
Field |
Element

```
@Target(value={METHOD,FIELD,ANNOTATION_TYPE,CONSTRUCTOR,PARAMETER,TYPE_USE})
 @Retention(value=RUNTIME)
 @Repeatable(value=Pattern.List.class)
 @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.

Examples (en):

rest-example, bval-evaluation-redeployment, bean-validation-design-by-contract

Examples (pt):

bean-validation-design-by-contract

Required Element Summary

Required Elements
Modifier and Type Required Element and Description

java.lang.String regexp

Optional Element Summary

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

- Element Detail
  - regexp
```
public abstract java.lang.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 java.lang.String message
```
    Returns:
    
    the error message template
    
    Default:
    
    "{javax.validation.constraints.Pattern.message}"
- - groups
```
public abstract java.lang.Class<?>[] groups
```
    Returns:
    
    the groups the constraint belongs to
    
    Default:
    
    {}
- - payload
```
public abstract java.lang.Class<? extends Payload>[] payload
```
    Returns:
    
    the payload associated to the constraint
    
    Default:
    
    {}

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