func BetweenF(left, right string) func(string) string {
	return func(s string) string {
		return Between(s, left, right)
	}
}
func BetweenF(left, right string) func(string) string {
	return func(s string) string {
		return Between(s, left, right)
	}
}
// BetweenF is the filter form for Between.