Question

Maybe the question is familiar but I need an explanation in this case.

Let’s assume that I have a file called test.txt. It has the following content:

An example of this line. The line has more than 20 characters.
[sql]SELECT * FROM LINE WHERE aLine = '123'[/sql]
blah blah blah blah...

OR what’s about

An example of this line. The line has more than 20 characters.
[sql]SELECT * FROM 
       LINE 
     WHERE aLine = '123'[/sql]
blah blah blah blah...

[sql] SELECT * FROM ME[/sql]

 etc..er
[sql]
   SELECT * FROM ALL
 [/sql]

I want to get a string between [sql] and [/sql] delimiters.

How to do that ? With Regular expression ?

Thanks for patience …

Answer 1

You can use the same solution found in this answer

string ExtractString(string s, string tag) {
     // You should check for errors in real-world code, omitted for brevity
     var startTag = "[" + tag + "]";
     int startIndex = s.IndexOf(startTag) + startTag.Length;
     int endIndex = s.IndexOf("[/" + tag + "]", startIndex);
     return s.Substring(startIndex, endIndex - startIndex);
}