Java正则表达式PatternSyntaxException类

java.util.regex.PatternSyntaxException类表示抛出的未经检查的异常，表示正则表达式模式中的语法错误。

类声明

以下是java.util.regex.PatternSyntaxException类的声明 -

public class PatternSyntaxException
   extends IllegalArgumentException

构造函数

类方法

方法继承

该类继承以下类中的方法 -

• java.lang.Throwable
• java.lang.Object

示例

以下示例显示了java.util.regex.Pattern.PatternSyntaxException类方法的用法。

package com.zaixian;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

public class PatternSyntaxExceptionDemo {
   private static String REGEX = "[";
   private static String INPUT = "The dog says meow " + "All dogs say meow.";
   private static String REPLACE = "cat";

   public static void main(String[] args) {
      try{
         Pattern pattern = Pattern.compile(REGEX);

         // get a matcher object
         Matcher matcher = pattern.matcher(INPUT); 
         INPUT = matcher.replaceAll(REPLACE);
      } catch(PatternSyntaxException e){
         System.out.println("PatternSyntaxException: ");
         System.out.println("Description: "+ e.getDescription());
         System.out.println("Index: "+ e.getIndex());
         System.out.println("Message: "+ e.getMessage());
         System.out.println("Pattern: "+ e.getPattern());
      }
   }
}

编译并运行上面的程序，这将产生以下结果 -

PatternSyntaxException: 
Description: Unclosed character class
Index: 0
Message: Unclosed character class near index 0
[
^
Pattern: [