Regex for Strong Password (8+ Chars)
Production-ready password strength regex using positive lookaheads to enforce lowercase, uppercase, numeric digit, and symbol requirements.
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Validation Result:
MATCH ✓
Pattern Breakdown & Tokens
- • (?=.*[a-z]) — requires at least one lowercase alphabetical character
- • (?=.*[A-Z]) — requires at least one uppercase letter
- • (?=.*\d) — requires at least one numerical digit
- • (?=.*[@$!%*?&]) — requires at least one special symbol
- • .{8,}$ — ensures minimum length of 8 total characters
Code Snippets
JavaScript
const passRegex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$/;
const isStrong = passRegex.test(password); Python
import re
pattern = r"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$"
is_strong = bool(re.match(pattern, password)) Go (Golang)
matched, err := regexp.MatchString(`^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$`, password) PHP
$isStrong = preg_match('/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$/', $password);Open the full tool: Open Full Regex Tester →
FAQ
How does this regular expression for Strong Password (8+ Chars) work?
Production-ready password strength regex using positive lookaheads to enforce lowercase, uppercase, numeric digit, and symbol requirements. The pattern is: ^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$
How to use this regex in JavaScript and Python?
In JavaScript: new RegExp("^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$").test(input). In Python: re.match(r"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$", input).
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