# Class PatternSyntaxException

java.lang.Object
java.lang.Throwable
java.lang.Exception
java.lang.RuntimeException
java.lang.IllegalArgumentException
java.util.regex.PatternSyntaxException

All Implemented Interfaces:
  `Serializable`

public class PatternSyntaxException extends IllegalArgumentException
Unchecked exception thrown to indicate a syntax error in a regular-expression pattern.

Since:
  1.4
See Also:
  - Serialized Form

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `PatternSyntaxException(String desc, String regex, int index)`
  Constructs a new instance of this class.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `String`
  `getDescription()`
  Retrieves the description of the error.
  `int`
  `getIndex()`
  Retrieves the error index.
  `String`
  `getMessage()`
  Returns a multi-line string containing the description of the syntax error and its index, the erroneous regular-expression pattern, and a visual indication of the error index within the pattern.
  `String`
  `getPattern()`
  Retrieves the erroneous regular-expression pattern.

  ### Methods declared in class Throwable

  `addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString`

  ### Methods declared in class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- ## Constructor Details

  - ### PatternSyntaxException

    public PatternSyntaxException(String desc, String regex, int index)
    Constructs a new instance of this class.
    Parameters:
      `desc` - A description of the error
      `regex` - The erroneous pattern
      `index` - The approximate index in the pattern of the error, or `-1` if the index is not known

- ## Method Details

  - ### getIndex

    public int getIndex()
    Retrieves the error index.
    Returns:
      The approximate index in the pattern of the error, or `-1` if the index is not known

  - ### getDescription

    public String getDescription()
    Retrieves the description of the error.
    Returns:
      The description of the error

  - ### getPattern

    public String getPattern()
    Retrieves the erroneous regular-expression pattern.
    Returns:
      The erroneous pattern

  - ### getMessage

    public String getMessage()
    Returns a multi-line string containing the description of the syntax error and its index, the erroneous regular-expression pattern, and a visual indication of the error index within the pattern.
    Overrides:
      `getMessage` in class `Throwable`
    Returns:
      The full detail message