@lou.codes/cron/dist/paddedRegExp.js

⏲️ Cron Quartz and Cron UNIX expression parser

import { join, optional } from "functional-expression";
/**
 * Regular expression to match field with an optional `0` to it's left.
 *
 * @category Regular Expression
 * @example
 * ```typescript
 * paddedRegExp(5); // "0?5"
 * ```
 * @param value Value to pad.
 * @returns RegExp to match value with padded `0`.
 */
export const paddedRegExp = value => join(optional(0), value);