Highlighting Language Syntax

[john tindell]

Hey does anyone know of a effiecient method of highlighting a richtext box for keywords. When I open the file and format the colors this is the code that i use for the keywords

 foreach(string word in this.ReservedWords)
 {		   
 	  Regex rgx=new Regex(word , RegexOptions.IgnoreCase); 
 	  MatchCollection mCol=rgx.Matches(this.rtfSource.Text); 
 	  foreach(Match m in mCol) 
 	  { 
 			this.rtfSource.HideSelection=true; 
 			this.rtfSource.Select(m.Index , m.Length); 
 			this.rtfSource.SelectionColor=Color.Blue; 
 			this.rtfSource.SelectionStart=m.Index + m.Length; 
 			this.rtfSource.SelectionLength=0; 
 	  } 
 }

This takes a long time to format, does anyone have any sugestions of a better way?

Thanks