Question

Im gone substring a description text after a certain count with .Substring(0, 100). I dont want to break in the middle of a word, if thats the case i would like to get to the first whitespace before the word.

I figure i check if the next character is not a " " its in the middle of the word.
My biggest issue is how do step backwards to get the index of the " " (whitespace).

this is what i got so far

        string description = "a long string";            

        description = Regex.Replace(description, @"(?></?\w+)(?>(?:[^>'""]+|'[^']*'|""[^""]*"")*)>", String.Empty);
        var newString = (description.Count() > 101) ? description.Substring(0, 101) : description;

        //i tried something like this
        var whatIsNext = newString.IndexOf(" ", 100, -20);

Answer 1

I think you’re looking for String.LastIndexOf:

Reports the zero-based index position of the last occurrence of a specified Unicode character within this instance. The search starts at a specified character position and proceeds backward toward the beginning of the string.

You want something like this:

int index = s.LastIndexOf(' ', 100);