Rules for character SAS format names

When creating a new SAS character format, the list of rules must be followed.

• The first character must be a dollar sign ($) - this differentiates it from a numeric format (numeric formats do not begin with dollar sign)
• The second character must be a letter or underscore
• Subsequent characters can be letters, underscores, or digits
• Cannot be more than 32 characters
• The format name cannot end with a number
• The format name should not be same as any SAS defined formats