CODEWITHSUNDEEP
c#string
Ajeet
Ajeet

Reputation: 31

C# string search

enter image description hereI have string which contain white space like 

string str="Option (A) and option (   B   ) and (c     )"

If and i want to search (A) (B) (C) position and length I know I can use string.replace(" ","") and search.

Here I know (B) is there but due to white space I am not able to get correct Index and Length .

For example in this case I want str.IndexOf("(B)",0) should return 22(I calculated manually). and also get length I mean my program should know here (B) start index=22 and length=9 (here length of (B) is not 3 because in string due to white space its increase to 9.

Thanks

Upvotes: 1

Views: 107

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 627537

Use a regex for this:

var str = "Option (A) and option (   B   ) and (c     )";
var matches = Regex.Matches(str, @"\([^()]*\)");
foreach (Match match in matches) {
    Console.WriteLine("Value: {0}", match.Value);
    Console.WriteLine("Position: {0}",match.Index);
    Console.WriteLine("Length: {0}",match.Length);
}

See the C# demo

A Match object has the necessary Index and Length properties you may access after getting all the matches.

The pattern here matches:

  • \( - a literal (
  • [^()]* - zero or more chars other than ( and )
  • \) - a literal ).

You may adjust it say, to match (, 0+ whitespaces, a letter, zero or more whitespaces and a ) by using @"\(\s*\p{L}\s*\)".

Upvotes: 3

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