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Validation
Low backtracking risk

Regex for Strong Password

This pattern enforces a minimum length plus lower, upper, digit, and symbol presence. It is useful for UI hints, but real password policy should still be enforced server-side.

Regex
/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^A-Za-z\d]).{12,}$/

Try this pattern

Matches current input
Tr0ub4dor&3!

1 match found in the current text.

Passing examples

  • Tr0ub4dor&3!
  • A-Longer9#Pass

Failing examples

  • short1A!
  • alllowercase123!

Code examples

JavaScript
const regex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^A-Za-z\d]).{12,}$/g;
regex.test(input);
Python
import re
pattern = re.compile(r"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^A-Za-z\d]).{12,}$")
bool(pattern.search(input))
Go
re := regexp.MustCompile("^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[^A-Za-z\\d]).{12,}$")
matched := re.MatchString(input)

Related Validation Patterns

Regex for Valid Email Address
/^[^\s@]+@[^\s@]+\.[^\s@]+$/i
Regex for URL Slug
/^[a-z0-9]+(?:-[a-z0-9]+)*$/
Regex for UUID v4
/^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i
Regex for IPv4 Address
/^(?:25[0-5]|2[0-4]\d|1?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|1?\d?\d)){3}$/
Regex for Hex Color
/^#?(?:[0-9a-fA-F]{3}|[0-9a-fA-F]{6})$/
Regex for Semantic Version
/^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-[0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*)?(?:\+[0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*)?$/