rx_StartsWithLetter = ('^[' + rx_Alphabetic + ']+' + '[' +
    rx_ValidCharacters_WithLineSpace + ']+')
global rx_StartsWithNumber
rx_StartsWithNumber = ('^[' + rx_Numeric + ']+' + '[' +
    rx_ValidCharacters_WithLineSpace + ']+')
global rx_WordSegments
rx_WordSegments = ('([' + rx_Symbols + ']+|' + '[' + rx_Numeric + ']+|' +
    '[' + rx_Alphabetic + ']+|' + '[' + rx_LineSpace + ']+)')
How does one implement wildcards, character classes, negated character classes, etc. in a model for a regular grammar?