A **regular expression** is a defined pattern used for matching and manipulating strings. In Java, there is a *built-in API* for regular expressions:
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```Java
java.util.regex package
```
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This package has three classes:
1. [Pattern class](https://www.educative.io/shoteditor/6600010382704640/preview)
2. [Matcher class](https://www.educative.io/shoteditor/6391682524250112/preview)
3. PatternSyntax Exception class
>This regular expression is not the property of one particular programming language; instead, it is supported by multiple languages.

# PatternSyntaxException class
The **`util.regex.PatternSyntaxException`** is used to indicate errors in a regular expression.
Some commonly used methods are:

| **Methods**    | **Description**    |
| --- | --- |
| `getDescription()`     | It returns the description of the error.    |
|  `getIndex()`   | It returns the index where the error occurred.    |
|  `getPattern()`   |  It returns the expression with the errors.    |
| `getMessage()`    | It returns the string containg the description of the array.   |




What is a regex.PatternSyntaxException class in Java?

Indicates errors in regex patterns, providing methods to retrieve error descriptions, indices, and patterns with errors.

Methods	Description
`getDescription()`	It returns the description of the error.
`getIndex()`	It returns the index where the error occurred.
`getPattern()`	It returns the expression with the errors.
`getMessage()`	It returns the string containg the description of the array.