例如,对于正则表达式 "[abc"(缺少关闭方括号),如果异常消息是 "java.util.regex.PatternSyntaxException: Unclosed character class near index 4",则意味着错误在索引 4 的位置附近(实际上是在索引 3 的位置开始的字符类 [abc 没有被正确关闭)。 4. 解决 "unclosed character class near index" 错误的建议或步...
当Java编译器在解析正则表达式时遇到未关闭的字符类(character class)时,就会抛出java.util.regex.PatternSyntaxException: Unclosed character class near index异常。字符类用于定义一组可能的字符,通常用方括号[]括起来。例如,[abc]表示匹配字符a、b或c之一。 异常示例 以下示例将演示如何触发Unclosed character class异...
Exception in thread "main" java.util.regex.PatternSyntaxException: Unclosed character class near index 0 [ ^ 出现此错误应该是字符转义出现问题: System.out.println(str.replaceAll("[", "22")); 解决方案:在[之前加上\ System.out.println(str.replaceAll("\[", "22"));...
使用str.split("[",15)时,出现Exception in thread "main" java.util.regex.PatternSyntaxException: Unclosed character class near index 0 [ ^的问题 解决办法为在[加上\\转义 str.split("\\[",15)
上述代码中,我们试图使用"abc"这个模式进行正则表达式匹配,然而,"“是一个元字符,它用于匹配前面的字符零次或多次,而不是作为普通字符使用。因此,编译器会抛出PatternSyntaxException异常,并输出错误信息"Unclosed character class near index 0”,意味着未关闭的字符类。
Exception in thread "main" java.util.regex.PatternSyntaxException: Unclosed character class near index 0 [ ^ 出现此错误应该是字符转义出现问题: System.out.println(str.replaceAll("[", "22")); 解决方案:在[之前加上\\ System.out.println(str.replaceAll("\\[", "22"));...
Exception in thread "Thread-4" java.util.regex.PatternSyntaxException: Unclosed character class near index 0 [ ^ at java.util.regex.Pattern.error(Unknown Source) at java.util.regex.Pattern.clazz(Unknown Source) at java.util.regex.Pattern.sequence(Unknown Source) at java.util.regex.Pattern.expr...
String[]strArray="hello world".split("["); Program output. Output Exceptionin thread"main"java.util.regex.PatternSyntaxException:Unclosedcharacterclassnear index0 1.3. ‘null’ is Not Allowed The method does not accept ‘null’ argument. It will throwNullPointerExceptionin case the method argument...
(ForkedBooter.java:407) Caused by: java.util.regex.PatternSyntaxException: Unclosed character class near index 5 .*/[ab ^ at java.util.regex.Pattern.error(Pattern.java:1955) at java.util.regex.Pattern.clazz(Pattern.java:2548) at java.util.regex.Pattern.sequence(Pattern.java:2063) at java....
packagecom.company.project.demo020301;importjava.util.regex.Pattern;publicclassClient{publicstaticvoidmain(String[]args){Patternpattern=Pattern.compile("A][bc");System.out.println(pattern);}} 运行结果: Exceptionin thread"main"java.util.regex.PatternSyntaxException:Unclosedcharacterclassnear index4A][bc...