1.2.4 Adding Expressions

These are regular expressions used by the lexer rules.

The expression file syntax is described in this document.

To add expressions to the minilang language:

• Right-click your project in the Solution Explorer and select 'Add | New Item...'.
• Select Visual C++ | Utility | Text File (.txt) item and name the file minilang.expr .
• Add the following code to the expression file:
  
  expressions minilang.expr
  {
      digit = "[0-9]";
      integer = "{digit}+";
      identifier = "{unicode_id_start}{unicode_id_cont}*";
      ws = "[\n\r\t ]";
      separators = "{ws}+";
  }