Regex for password PHP [duplicate]

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^\S*(?=\S{8,})(?=\S*[a-z])(?=\S*[A-Z])(?=\S*[\d])\S*$

From the fine folks over at Zorched.

  • ^: anchored to beginning of string
  • \S*: any set of characters
  • (?=\S{8,}): of at least length 8
  • (?=\S*[a-z]): containing at least one lowercase letter
  • (?=\S*[A-Z]): and at least one uppercase letter
  • (?=\S*[\d]): and at least one number
  • $: anchored to the end of the string

To include special characters, just add (?=\S*[\W]), which is non-word characters.

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