Question

如何获取2个字符串之间的值？我有一个格式为d1048_m325的字符串，我需要得到d和_之间的值。这是如何在C＃中完成的？

谢谢，

迈克

Answer 1

(?<=d)\d+(?=_)

应该有效（假设您正在寻找d和_之间的整数值）：

(?<=d) # Assert that the previous character is a d
\d+    # Match one or more digits
(?=_)  # Assert that the following character is a _

在C＃中：

resultString = Regex.Match(subjectString, @"(?<=d)\d+(?=_)").Value;

Answer 2

或者，如果您想要更自由地了解d和_之间的内容：

d([^_]+)

是

d       # Match d
([^_]+) # Match  (and capture) one or more characters that isn't a _

Answer 3

尽管此页面上的正则表达式答案可能很好，但我采用了C＃方法向您展示了另一种选择。请注意，我输入了每一步，因此易于阅读和理解。

//your string
string theString = "d1048_m325";

//chars to find to cut the middle string
char firstChar = 'd';
char secondChar = '_';

//find the positions of both chars
//firstPositionOfFirstChar +1 to not include the char itself
int firstPositionOfFirstChar = theString.IndexOf(firstChar) +1; 
int firstPositionOfSecondChar = theString.IndexOf(secondChar);

//the middle string will have a length of firstPositionOfSecondChar - firstPositionOfFirstChar  
int middleStringLength = firstPositionOfSecondChar - firstPositionOfFirstChar;

//cut!
string middle = theString.Substring(firstPositionOfFirstChar, middleStringLength);

Answer 4

您也可以使用延迟量词

d（\ d +？）_

2个字符串之间的正则表达式值

4 个答案: