@coven/cron@0.3.3

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import { exists, group, or } from "jsr:@coven/expression@^0.3.3";
import { LIST_EXPRESSION_SEPARATOR_TOKEN } from "./tokens.ts";

/**
 * Regular expression to match lists.
 *
 * @example
 * ```typescript
 * valueOrListRegExp(13); // "(?:13|(?:(?:13,)+13))"
 * ```
 * @param value Value to match by itself or as a list.
 * @returns RegExp to match value or list.
 */
export const valueOrListRegExp = <Value extends number | string>(
	value: Value,
): `(?:${Value}|(?:(?:${Value},)+${Value}))` =>
	group(
		or(
			value,
			group(exists(group(value, LIST_EXPRESSION_SEPARATOR_TOKEN)), value),
		),
	);