Question

I’ve got a RichTextBox, and would like to highlight a whole word, given just its starting index.

I’ve been able to highlight a word if the starting index and length is known, however in this case I do not know the length of the word. Is it possible to highlight from a starting index to the first occurance of a space?

UPDATE:

This is what I’ve tried so far:

resultsRichTextBox.Select(novelOffset - 2, searchString.Length);

Unfortunately ‘searchstring’ is not always the length of the word being searched for, so I need a way of finding the amount of characters from novelOffset - 2 till the nearest space.

Answer 1

You can do something like this:

int length = this.richTextBox1.Text.Skip(startIdx)
                              .TakeWhile(x => char.IsLetterOrDigit(x))
                              .Count();
this.richTextBox1.Select(startIdx, length);
this.richTextBox1.SelectionBackColor = Color.Yellow;

Obviously you can change char.IsLetterOrDigit with x != ' ' or whatever you prefer.