C＃正则表达式，通过引用字符串提取字符串

Question

Edit: Solution by @Heinzi https://stackoverflow.com/a/1731641/87698

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I got two strings, for example someText-test-stringSomeMoreText? and some kind of pattern string like this one {0}test-string{1}? .

I'm trying to extract the substrings from the first string that match the position of the placeholders in the second string.

The resulting substrings should be: someText- and SomeMoreText .

I tried to extract with Regex.Split("someText-test-stringSomeMoreText?", "[.]*test-string[.]*\\?" . However this doesn't work.

I hope somebody has another idea...

Answer 1

One option you have is to use named groups:

(?<prefix>.*)test-string(?<suffix>.*)\?

This will return 2 groups containing the wanted prefix and the suffix.

var match = Regex.Match("someText-test-stringSomeMoreText?", 
    @"(?<prefix>.*)test-string(?<suffix>.*)\?");
Console.WriteLine(match.Groups["prefix"]);
Console.WriteLine(match.Groups["suffix"]);

Answer 2

I got a solution, at least its a bit dynamical.

First I split up the pattern string {0}test-string{1}? with string[] patternElements = Regex.Split(inputPattern, @"(\\\\\\{[a-zA-Z0-9]*\\})");

Then I spit up the input string someText-test-stringSomeMoreText? with string[] inputElements = inputString.Split(patternElements, StringSplitOptions.RemoveEmptyEntries);

Now the inputElements are the text pieces corresponding to the placeholders {0},{1},...