func Main() int {
	m, err := NewMatcher(
		WithSearchTextFromArgs(os.Args[1:]),
	)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		return 1
	}
	m.PrintMatchingLines()
	return 0
}

func Main() int {
	m, err := NewMatcher()
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		return 1
	}
	m.PrintMatchingLines()
	return 0
}

stdin three_matching_lines.txt
exec match MAGIC
stdout -count=1 '^this line is MAGIC\n'
stdout -count=1 '^MAGIC is also on this line\n'
stdout -count=1 '^and MAGIC is here too\n'

-- three_matching_lines.txt --
this won't match
this line is MAGIC

MAGIC is also on this line
but not this one
and MAGIC is here too
MAGIC is a lie