如何使用 c# 拆分字符串

Question

I am working on a project and i want to split a string like below

DEV~Hi there is Sunday Tommorrow=1

I want to split this string as I want only text which is between the tilde(~) sign and equal sign(=). I also don't need ~ and = sign.

I have tried following code but not able to know how to split the string with tilde

obj.Code.Trim().Split('=')[1].Trim()

With the above code I can only split the string from = to sign but I want to remove the ~ sign and text on the left hand side also.

Can anyone suggest the solution?

Answer 1

Assuming your text would have exactly one tilde and equal sign, you may try the following string split:

string input = "DEV~Hi there is Sunday Tommorrow=1";
var match = Regex.Split(input, @"[~=]")[1];
Console.WriteLine(match);  // Hi there is Sunday Tommorrow

Another approach, perhaps a bit more robust, would be to use a regex replacement:

string input = "DEV~Hi there is Sunday Tommorrow=1";
string match = Regex.Replace(input, @"^.*~(.*)=.*$", "$1");
Console.WriteLine(match);  // Hi there is Sunday Tommorrow

Answer 2

You are trying to match a specific pattern. You need a regular expression for this. The expression ~.*= will match everything between ~ and = , including the characters:

~Hi there is Sunday Tommorrow=

To avoid capturing these characters you can use (?<=~).*(?==) . The call Regex.Match(myString,"(?<=~).*(?==)") will catch just the part between the markers:

var match=Regex.Match(myString,"(?<=~).*(?==)");
Console.WriteLine(match);
-------------------------------
Hi there is Sunday Tommorrow

These are called look-around assertions . The first one, (?<=~) says that the match is precededed by ~ but the marker isn't included. The second one, (?==) says that the match is followed by = but again, the marker isn't included.

Another possibility is to use a group to capture the part(s) you want by using parentheses:

var m=Regex.Match(s,"~(.*)=");  
Console.WriteLine(m.Groups[1]);
---------------------------------
Hi there is Sunday Tommorrow

You can use more than one group in a pattern

Answer 3

The proper way to do this is using RegEx, But a smiple soloution for this case:

obj.Code.Trim().Split('~')[1].Split('=')[0].Trim()

Answer 4

Try the below code:

obj.Code.Trim().Split('=')[0].Trim().Split('~')[1]