Cron Expression

Validates cron schedule expressions (5 fields: minute, hour, day of month, month, day of week) structurally.

✓ Task scheduling validation✓ Cron job UI inputs✓ SaaS automation rules

Risk

Test String

4 matches

* * * * *
*/5 10-12 * * *
0,30 18-23 * * 1-5
0 0 1 1 *

(?:…){4}Non-capturing group— Non-capturing group — groups without capturing (no index assigned) — repeated exactly 4 times · {4} — exactly 4 times

(?:…)Non-capturing group— Non-capturing group — groups without capturing (no index assigned)

(?:…)?Non-capturing group— Non-capturing group — groups without capturing (no index assigned) — repeated zero or one time (optional) · ? — zero or one time (optional)

(?:…)*Non-capturing group— Non-capturing group — groups without capturing (no index assigned) — repeated zero or more times (greedy) · * — zero or more times (greedy)

\s+space— \s — whitespace (space, tab, newline…) — repeated one or more times (greedy) · + — one or more times (greedy)

(?:…)Non-capturing group— Non-capturing group — groups without capturing (no index assigned)

\*\*— \* — escaped character '*'

||— | — alternation: matches expression on left OR right

\d+digit— \d — digit (0–9) — repeated one or more times (greedy) · + — one or more times (greedy)

(?:…)?Non-capturing group— Non-capturing group — groups without capturing (no index assigned) — repeated zero or one time (optional) · ? — zero or one time (optional)

\/\/— \/ — escaped character '/'

\d+digit— \d — digit (0–9) — repeated one or more times (greedy) · + — one or more times (greedy)

(?:…)*Non-capturing group— Non-capturing group — groups without capturing (no index assigned) — repeated zero or more times (greedy) · * — zero or more times (greedy)

,,— ',' — literal character

(?:…)Non-capturing group— Non-capturing group — groups without capturing (no index assigned)

(?:…)?Non-capturing group— Non-capturing group — groups without capturing (no index assigned) — repeated zero or one time (optional) · ? — zero or one time (optional)

Pattern: 138 charsInput: 54 chars

100% client-side · private

✓ Valid Examples

* * * * *
*/5 10-12 * * *
0,30 18-23 * * 1-5
0 0 1 1 *

✗ Invalid Examples

* * * * * * * *
invalid-cron-expr
* * * *
a * * * *

Usage & Integration

Validate Cron Expression natively in your backend or frontend without copying regex strings.

Node / Edge

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

validate('cron-expression', '...');

Python

from regexto_validators import validate

validate("cron-expression", "...")

Go

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

valid, err := validators.Validate("cron-expression", "...")

PHP

use RegexTo\Validators\Validator;

Validator::validate('cron-expression', '...');

Rust

use regexto_validators::validate;

let is_valid = validate("cron-expression", "...").unwrap();