Question

I have a string like “@1234@ == val1 && @2312@ != val2”. I want to get 1234 and 2312 which are embedded using ‘@’ separated into an array. The string can contain more than one items embedded using ‘@’.

update: will contain only integer values between ‘@’.

update2:valid input string which can occur are “@some int value@ == val1” or similar kind of string separated with ‘&&’ or ‘||’
sample input strings:

              "@234@ == val1",
              "@3456@ == 345 && @34563@ != 'Y'",
              "@1234@ != val1 || @1234@ != val2 || @1234@ != val3"      

what is the best way to achieve this?

Answer 1

Another way using LINQ:

 var list = input.Split(new[] { '@' }, StringSplitOptions.RemoveEmptyEntries);
 var result = Enumerable.Range(0, list.Length / 2)
                        .Select(i => list.ElementAt(i*2));

---

In case your input like:

 "@12@@34@ == val1 && @2312@ != val2"

You can use this below Linq:

var list = input.Split(new[] { "==", "!=", "&&", "||" }, 
            StringSplitOptions.RemoveEmptyEntries);

var result = Enumerable.Range(0, list.Length/2)
            .Select(i => list.ElementAt(i*2).Trim())
            .Select(s => s.Substring(1, s.Length - 2));