Regular Expression Patterns (RegEx)

Must

• Patterns must always specify the expected length using {}

May

• Patterns may include anchors: ^ and $
• Patterns may use ranges such as: [0-9], [a-z], or [A-Z]
• Patterns may use partial ranges such as: [B-F]
• Patterns may use or such as: [ABCDE]{1}, or (A|B|C|D|E){1}
• Patterns may use dot as a wildcard: (.){1}
• Patterns may use zero or one: A?B?
• Patterns may use not: [^ABCD]
• Patterns may use length operators: {1} or {1,} or {1,2}

Must Not

• Patterns cannot include .*
• Patterns cannot include .+
• Patterns cannot span whitespace.
• Token must have more than 3 characters to match.
• Token must 30 characters or less.
• Patterns cannot use class descriptors such as: [:digits:]
• Back references are not supported: (A)\1