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Quick Reference:

  • . - Any character except newline
  • \d - Digit (0-9)
  • \w - Word character (a-z, A-Z, 0-9, _)
  • ^ - Start of string
  • $ - End of string
  • * - 0 or more occurrences
  • + - 1 or more occurrences
  • ? - 0 or 1 occurrence