refactor: Update parsing of flight schedule data for improved accuracy and functionality

internal/parsers/schedule_parser.go

@@ -13,11 +13,11 @@ const (
 	AirportCode         = "airport"
 	Date                = "date"
 	Task                = "task"
-	IndexPattern        = `(?P<idx>\(?L?\d+\)?\.?)`
+	IndexPattern        = `(?P<idx>\(?L?[0-9]+\)?\.?)`
 	DatePattern         = `\s?(?P<date>\d{2}\w{3})`
 	TaskPattern         = `\s?(?P<task>[A-Z]\/[A-Z])`
 	WaypointPattern     = `\s?(?P<arr_time>\d{4}(\(\d{2}\w{3}\))?)\/?(?P<airport>\w{3})\/?(?P<dep_time>\d{4}(\(\d{2}\w{3}\))?)`
-	FlightNumberPattern = `\s?(?P<number>[0-9A-Z][A-Z]\d{3,5})`
+	FlightNumberPattern = `\s?(?P<number>[0-9A-Z][0-9A-Z]\d{3,5})`
 	RegisterPattern     = `\s?(?P<reg>B\d{4})`
 )
 
@@ -53,6 +53,7 @@ func FindWaypoints(message string) map[string]string {
 
 	return result
 }
+
 func ParseLine(line string) *domain.FlightSchedule {
 	cleanLine := strings.TrimSpace(line)
 	words := strings.Split(cleanLine, " ")