13 alphanumeric string starts with 2 characters followed by 9 digits and ends with 2 characters. The last 2 characters are "GB"
Parcel Force tracking number format
13 alphanumeric string starts with 2 characters followed by 9 digits and ends with 2 characters.
Valid prefix: EA,EB,EC,ED,EE and CP
Royal Mail tracking number example
RJ733259145GB
RJ733258817GB
JV654386368GB
RS907419159CH
RZ435403332GB
RZ421569371GB
Parcel Force tracking number example
EE698742743GB
EE584464110GB
EK333490866GB
EK408553403GB
EK333487972GB
CU140746133GB
LA540591358GB
EH635000002GB
EK333672121GB
EK880068995GB