Module validation 

Validation helpers.

Lightweight validators for common formats. Includes a Luhn implementation for credit card numbers, IBAN/phone/SSN validation, and simple ASCII/UTF-8 checks.

Examples:

use toolchest::validation::{validate_credit_card, is_ascii, is_utf8};
assert!(validate_credit_card("4242424242424242"));
assert!(is_ascii("hello"));
assert!(is_utf8("ok".as_bytes()));

Functions

is_ascii

True if string is ASCII

is_utf8

True if bytes are valid UTF-8

validate_credit_card

Validate credit card number using Luhn algorithm

validate_iban

Validate IBAN using the ISO 13616 algorithm (mod-97 == 1)

validate_phone

Validate a phone number in E.164 format.

validate_ssn

Validate a US Social Security Number (SSN).