type:: [[Function/On strings]]

• For Regular Expression (REGEX) [[Syntax]], see
  • xpath/regex specification
  • https://regexone.com/ #Tutorial
• Some frequent patterns
  • starts with "cat", case insensitive
    • REGEX (?s, "^cat", "i")
  • ends with "cat", case insensitive
    • REGEX (?s, "cat$", "i")
  • contains a number
    • REGEX (?s, "[0-9]")