Let us change our traditional attitude to the construction of programs. Instead of imagining that our main task is to instruct a computer what to do, let us concentrate rather on explaining to human beings what we want a computer to do. --Donald Knuth

Extract Keywords from a Search String in C#

Downloads

Summary

When a user enters a string into a textbox to initiate a search, the developer has to parse that string and convert it to a query of some kind. This little snippet uses a very simple regular expression to extract the keywords from the search string as an array of strings. From this array you can then create your search query.

public static string[] GetSearchWords(string text)
{
   string pattern = @"\S+";
   Regex re = new Regex(pattern);

   MatchCollection matches = re.Matches(text);
   string[] words = new string[matches.Count];
&nbsp;&nbsp;&nbsp;for (int i=0; i<matches.Count; i++)
&nbsp;&nbsp;&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;words[i] = matches[i].Value;
&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;return words;
}

Dont' forget the using directive:

using System.Text.RegularExpressions