如何使用正则表达式从下面提取特定的字符串？ 最好的方法

Question

I have following kind of string

/asdfd-dfsdf-sadfdfsdf-safdsfok-785452145x/dshfkjsd-sdfsd-sdfsdfsn-sfsdfe-jsdfdss/9?sdf=sdfsdf32d-0sdf8d-49sfe-asdf7-4fsfs32dd73880

out of which i wan to extract only 785452145x

What would be the best way? i use C# 2.0

Answer 1

// setup the input data
string inputString = "/asdfd...";

// pull out string from beginning to second slash
// firstPart = "/asdfd...fok-785452145x/"
string firstPart = inputString.Substring(0, inputString.IndexOf("/", 1));

// grab last data element after the last hyphen
// lastElement = "785452145x";
string lastElement = firstPart.Substring(firstPart.LastIndexOf("-") + 1);

// do something with lastElement...

Answer 2

If you're trying to match that family of characters in the string this regex would put it in the first matching group.

/[a-z]+-[a-z]+-[a-z]+-[a-z]+-([0-9a-z]+).*

If you're trying to match that exact string, there's no need for a regex.

Answer 3

Since you want that specific string, there is no need for a regex. If you simply want to know if the large string contains the string you are looking for, try

inputString.Contains("785452145x");

Which will give you a bool indicating whether or not the string was found.

Answer 4

您要求使用正则表达式...

string answer = Regex.Match(input, @"^/.+-(.+)/.+").Groups[1].Value;