All files / validators alphabetValidator.js

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const alphabetValidator = (alphabet) => {
	const illegal = alphabet.match(new RegExp("[\\W_]"));
	if (illegal) {
		throw new Error(
			`Illegal character found in alphabet: ${alphabet.charAt(illegal.index)}`
		);
	}
 
	const duplicate = alphabet.match(new RegExp("(.+)(?=.*?\\1)", "g"));
	if (duplicate) {
		throw new Error(`Duplicate character found in alphabet: ${duplicate[0]}`);
	}
};
 
export { alphabetValidator };