Function isValidRangeOrNumber

packages/server/src/services/schedule/utils.ts:45–58

(s: string, min: number, max: number)

    // Returns true if s is a valid integer in [min, max] or a valid range "start-end"
    const isValidRangeOrNumber = (s: string, min: number, max: number): boolean => {
        const dashIdx = s.indexOf('-')
        if (dashIdx !== -1) {
            const startStr = s.slice(0, dashIdx)
            const endStr = s.slice(dashIdx + 1)
            if (!/^\d+$/.test(startStr) || !/^\d+$/.test(endStr)) return false
            const start = parseInt(startStr, 10)
            const end = parseInt(endStr, 10)
            return start >= min && start <= max && end >= min && end <= max && start <= end
        }
        if (!/^\d+$/.test(s)) return false
        const n = parseInt(s, 10)
        return n >= min && n <= max
    }

    // Validate a single cron field: supports *, numbers, ranges (n-m), steps (*/s, n/s, n-m/s), and comma-separated lists.
    // When `allowL` is true, also accepts the standalone `L` token (used for the day-of-month field to mean "last day of month").