This example uses the RegEx to search the keywords and highlight them with different color
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| //Synatx Highlight inside Rich Text box | |
| private void HighLightSyntax() | |
| { | |
| //rtbCommand.Enabled = false; | |
| //rtbCommand.ReadOnly = true; | |
| //rtbCommand.Cursor = Cursors.No; | |
| rtbCommand.BorderStyle = BorderStyle.None; | |
| //Add RichTextBox | |
| // private System.Windows.Forms.RichTextBox rtbCommand; | |
| //define the JScript keywords | |
| string jSkeywords = "abstract|arguments|boolean|break|byte"; | |
| jSkeywords = jSkeywords.Replace("|", "\\b|\\b"); | |
| // create regular Expression | |
| Regex regExp = new Regex( "\\b" +jSkeywords + "\\b", | |
| RegexOptions.Compiled | RegexOptions.Multiline); | |
| //find all the matches in match collection | |
| MatchCollection _matches = regExp.Matches(rtbCommand.Text); | |
| // process all the matched keywords | |
| foreach (Match match in _matches) | |
| { | |
| rtbCommand.Select(match.Index, match.Length); | |
| rtbCommand.SelectionColor = Color.Red; | |
| //de-select word and move cursor to the end | |
| rtbCommand.DeselectAll(); | |
| rtbCommand.SelectionStart = rtbCommand.Text.Length; | |
| } | |
| } | |
| /*It can be called onKeyUp event like | |
| if(e.KeyCode == Keys.Enter) | |
| { | |
| HighLightSyntax(); | |
| }*/ | |
