java.util.regex.PatternSyntaxException 类表示抛出未经检查的异常,表示正则表达式模式中存在语法错误.
以下是 java.util.regex.PatternSyntaxException class :
public class PatternSyntaxException extends IllegalArgumentException
Sr.No | 方法&描述 |
---|---|
1 | PatternSyntaxException(String desc,String regex,int index) 构造此类的新实例. |
Sr.No | 方法&说明 |
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1 | String getDescription( ) 检索错误的描述. |
2 | int getIndex() 检索错误索引. |
3 | String getMessage() 返回一个多行字符串,其中包含语法错误及其索引的描述,错误的正则表达式模式以及模式中错误索引的可视指示. |
4 | String getPattern() 检索错误的正则表达式模式. |
此类继承以下类中的方法 :
Java.lang.Throwable
Java.lang.Object
f下面的例子显示了java.util.regex.Pattern.PatternSyntaxException类方法的用法.
package com .it1352; 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()); } } }
让我们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: [