Main Function
The main features of this natural language cron expression generator include:
1. Support for natural language input, allowing users to create cron expressions using everyday language.
2. Support for multiple time units, including seconds, minutes, hours, days, weeks, months, and years.
3. Support for various time intervals, including every few seconds, every few minutes, every few hours, every few days, every few weeks, every few months, and every few years.
4. Support for multiple time ranges, including starting from a specific time, ending at a specific time, and within a specific time period.