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Linear time regular expressions for Java

There is a newer version: 1.7

// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package com.google.re2j;

/**
 * An exception thrown by the parser if the pattern was invalid.
 *
 * Following {@code java.util.regex.PatternSyntaxException}, this is an
 * unchecked exception.
 */
public class PatternSyntaxException extends RuntimeException {

  private final String error;  // the nature of the error
  private final String input;  // the partial input at the point of error.

  public PatternSyntaxException(String error, String input) {
    super("error parsing regexp: " + error + ": `" + input + "`");
    this.error = error;
    this.input = input;
  }

  public PatternSyntaxException(String error) {
    super("error parsing regexp: " + error);
    this.error = error;
    this.input = "";
  }

  /**
   * Retrieves the error index.
   *
   * @return  The approximate index in the pattern of the error,
   *         or -1 if the index is not known
   */
  public int getIndex() {
    return -1;
  }

  /**
   * Retrieves the description of the error.
   *
   * @return  The description of the error
   */
  public String getDescription() {
    return error;
  }

  /**
   * Retrieves the erroneous regular-expression pattern.
   *
   * @return  The erroneous pattern
   */
  public String getPattern() {
    return input;
  }

}