#!/usr/bin/env python3
import subprocess
import sys

# Ensure exrex is installed
try:
    import exrex
except ImportError:
    subprocess.check_call([sys.executable, "-m", "pip", "install", "exrex"])
    import exrex

import argparse

def main():
    parser = argparse.ArgumentParser(description="Generate all possibilities from a regex")
    parser.add_argument("regex", type=str, help="Regex pattern (finite)")
    args = parser.parse_args()

    try:
        for match in exrex.generate(args.regex):
            print(match)
    except Exception as e:
        print(f"Error: {e}", file=sys.stderr)

if __name__ == "__main__":
    main()