Security

#password

#security

#auth

#validation

Updated: Sep 14, 2026

Strong Password

Matches a strong password: minimum 8 characters with at least one uppercase letter, one lowercase letter, one digit, and one special character.

✓ User registration✓ Password change forms✓ Security policy enforcement

Safe

Test String

3 matches

P@ssw0rd
Str0ng#Pass!
MySecure_P4ss

(?=…)Lookahead (?=…)— Positive lookahead — asserts the following text matches this pattern (zero-width)

.*.— . — matches any character except newline (unless 's' flag is set) — repeated zero or more times (greedy) · * — zero or more times (greedy)

[…]Character class […]— Matches any single character listed in this set

(?=…)Lookahead (?=…)— Positive lookahead — asserts the following text matches this pattern (zero-width)

.*.— . — matches any character except newline (unless 's' flag is set) — repeated zero or more times (greedy) · * — zero or more times (greedy)

[…]Character class […]— Matches any single character listed in this set

(?=…)Lookahead (?=…)— Positive lookahead — asserts the following text matches this pattern (zero-width)

.*.— . — matches any character except newline (unless 's' flag is set) — repeated zero or more times (greedy) · * — zero or more times (greedy)

\ddigit— \d — digit (0–9)

(?=…)Lookahead (?=…)— Positive lookahead — asserts the following text matches this pattern (zero-width)

.*.— . — matches any character except newline (unless 's' flag is set) — repeated zero or more times (greedy) · * — zero or more times (greedy)

[…]Character class […]— Matches any single character listed in this set

[…]{8,}Character class […]— Matches any single character listed in this set — repeated at least 8 times · {8,} — at least 8 times

A-ZA-Z— A-Z — range from 'A' to 'Z'

a-za-z— a-z — range from 'a' to 'z'

\ddigit— \d — digit (0–9)

@@— '@' — literal character

$$— '$' — literal character

!!— '!' — literal character

%%— '%' — literal character

**— '*' — literal character

??— '?' — literal character

&&— '&' — literal character

##— '#' — literal character

^^— '^' — literal character

((— '(' — literal character

))— ')' — literal character

\-\-— \- — escaped character

__— '_' — literal character

++— '+' — literal character

==— '=' — literal character

Pattern: 84 charsInput: 35 chars

100% client-side · private

✓ Valid Examples

P@ssw0rd
Str0ng#Pass!
MySecure_P4ss

✗ Invalid Examples

password
PASSWORD1
p@ssword
Short1!

Usage & Integration

Validate Strong Password natively in your backend or frontend without copying regex strings.

Node / Edge

import { validate } from '@regexto/validators';

validate('password-strong', '...');

Python

from regexto_validators import validate

validate("password-strong", "...")

Go

import "github.com/regex-to/validators-go"

valid, err := validators.Validate("password-strong", "...")

PHP

use RegexTo\Validators\Validator;

Validator::validate('password-strong', '...');

Rust

use regexto_validators::validate;

let is_valid = validate("password-strong", "...").unwrap();