StringPattern (keepanno API)

```
@Target(ANNOTATION_TYPE)
@Retention(CLASS)
public @interface StringPattern
```
A pattern structure for matching strings.
If no properties are set, the default pattern matches any string.

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`java.lang.String`	`endsWith`	Matches strings ending with the given suffix.
`java.lang.String`	`exact`	Exact string content.
`java.lang.String`	`startsWith`	Matches strings beginning with the given prefix.

- Element Detail
  - exact
```
java.lang.String exact
```
    Exact string content.
    For example, "foo" or "java.lang.String".
    Mutually exclusive with the following other properties defining string-exact-pattern:
    
    startsWith
    endsWith
    Default:
    
    ""
- - startsWith
```
java.lang.String startsWith
```
    Matches strings beginning with the given prefix.
    For example, "get" to match strings such as "getMyValue".
    Mutually exclusive with the property `exact` also defining string-prefix-pattern.
    
    Default:
    
    ""
- - endsWith
```
java.lang.String endsWith
```
    Matches strings ending with the given suffix.
    For example, "Setter" to match strings such as "myValueSetter".
    Mutually exclusive with the property `exact` also defining string-suffix-pattern.
    
    Default:
    
    ""