Create Language with object model

public static SyntaxLanguage PlainText {
    get {
        // Create a language
        SyntaxLanguage plainTextLanguage = new SyntaxLanguage("Plain Text", false);
        plainTextLanguage.ExampleText = "Plain text with\r\n2 lines.";

        // Get the default style
        HighlightingStyle defaultHighlightingStyle = plainTextLanguage.HighlightingStyles["DefaultStyle"];

        // Create the default state
        LexicalState lexicalState = new LexicalState("DefaultState");
        lexicalState.DefaultHighlightingStyle = defaultHighlightingStyle;
        lexicalState.LexicalPatternGroups.Add(new LexicalPatternGroup(LexicalPatternType.Regex, "WhitespaceToken", defaultHighlightingStyle, "{WhitespaceMacro}+"));
        lexicalState.LexicalPatternGroups[lexicalState.LexicalPatternGroups.Count - 1].IsWhitespace = true;
        lexicalState.LexicalPatternGroups.Add(new LexicalPatternGroup(LexicalPatternType.Regex, "LineTerminatorToken", defaultHighlightingStyle, "{LineTerminatorMacro}+"));
        lexicalState.LexicalPatternGroups[lexicalState.LexicalPatternGroups.Count - 1].IsWhitespace = true;
        lexicalState.LexicalPatternGroups.Add(new LexicalPatternGroup(LexicalPatternType.Regex, "IdentifierToken", defaultHighlightingStyle, "{AlphaMacro}({WordMacro})*"));
        lexicalState.LexicalPatternGroups.Add(new LexicalPatternGroup(LexicalPatternType.Regex, "NumberToken", defaultHighlightingStyle, "{DigitMacro}+", "{NonWordMacro}"));

        // Add the states
        plainTextLanguage.LexicalStates.Add(lexicalState);
        plainTextLanguage.DefaultLexicalState = lexicalState;

        // Mark that updating is complete
        plainTextLanguage.IsUpdating = false;

        return plainTextLanguage;
    }
}