如何在regex中表示双引号字符（“）？ [英] How to represent the double quotes character (") in regex?

问题描述

我需要使用regex来检查字符串是否以双引号字符开头（），并以双引号字符。

问题是我不能使用双引号字符，还有任何其他方式在regex中表示引号字符，或者在字符串中表示

  String s =; //？
  




解决方案

首先，双引号字符在regex中没有什么特别之处 - 它只是另一个字符，所以它不需要从正则表达式的角度转义 / p>



但是，因为java使用双引号来定义字符串常量，如果要在java中使用双引号创建一个字符串，必须避开它们。

此代码将测试您的String是否匹配：

  if（str.matches（\。* \））{
 //此字符串以双引号开头和结尾
} 
  

注意，您不需要添加输入标记的开始和结束（ ^ 和 $ ），因为 matches（）要求整个输入匹配返回true - ^ 和 $ 。

I need to use regex, to check if a string starts with a double quotes character (") and ends with a double quotes character too.

The problem is I can't use a double quotes character, cause it gets confused. Is there any other way to represent a double quotes character " in regex, or in string in general?

String s = """;    // ?

解决方案

Firstly, double quote character is nothing special in regex - it's just another character, so it doesn't need escaping from the perspective of regex.

However, because java uses double quotes to delimit String constants, if you want to create a string in java with a double quote in it, you must escape them.

This code will test if your String matches:

if (str.matches("\".*\"")) {
    // this string starts and end with a double quote
}

Note that you don't need to add start and end of input markers (^ and $) in the regex, because matches() requires that the whole input be matched to return true - ^ and $ are implied.

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