func strings.FieldsFunc

3 uses

	strings (current package)
		strings.go#L401: 		return FieldsFunc(s, unicode.IsSpace)
		strings.go#L441: func FieldsFunc(s string, f func(rune) bool) []string {

	github.com/robfig/cron/v3
		parser.go#L238: 	ranges := strings.FieldsFunc(field, func(r rune) bool { return r == ',' })