Regular Expressions 101

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"
([A-PR-UWYZ](?:[A-HK-Y][0-9](?:[0-9]|[ABEHMNPRV-Y])?|[0-9]([0-9]|[A-HJKPSTUW])?)) ?([0-9][ABD-HJLNP-UW-Z]{2})
"
gi
1st Capturing Group
([A-PR-UWYZ](?:[A-HK-Y][0-9](?:[0-9]|[ABEHMNPRV-Y])?|[0-9]([0-9]|[A-HJKPSTUW])?))
Match a single character present in the list below
[A-PR-UWYZ]
A-P matches a single character in the range between A (index 65) and P (index 80) (case insensitive)
R-U matches a single character in the range between R (index 82) and U (index 85) (case insensitive)
WYZ
matches a single character in the list WYZ (case insensitive)
Non-capturing group
(?:[A-HK-Y][0-9](?:[0-9]|[ABEHMNPRV-Y])?|[0-9]([0-9]|[A-HJKPSTUW])?)
1st Alternative
[A-HK-Y][0-9](?:[0-9]|[ABEHMNPRV-Y])?
Match a single character present in the list below
[A-HK-Y]
A-H matches a single character in the range between A (index 65) and H (index 72) (case insensitive)
K-Y matches a single character in the range between K (index 75) and Y (index 89) (case insensitive)
Match a single character present in the list below
[0-9]
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case insensitive)
Non-capturing group
(?:[0-9]|[ABEHMNPRV-Y])?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
1st Alternative
[0-9]
Match a single character present in the list below
[0-9]
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case insensitive)
2nd Alternative
[ABEHMNPRV-Y]
Match a single character present in the list below
[ABEHMNPRV-Y]
ABEHMNPR
matches a single character in the list ABEHMNPR (case insensitive)
V-Y matches a single character in the range between V (index 86) and Y (index 89) (case insensitive)
2nd Alternative
[0-9]([0-9]|[A-HJKPSTUW])?
Match a single character present in the list below
[0-9]
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case insensitive)
2nd Capturing Group
([0-9]|[A-HJKPSTUW])?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
1st Alternative
[0-9]
Match a single character present in the list below
[0-9]
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case insensitive)
2nd Alternative
[A-HJKPSTUW]
Match a single character present in the list below
[A-HJKPSTUW]
A-H matches a single character in the range between A (index 65) and H (index 72) (case insensitive)
JKPSTUW
matches a single character in the list JKPSTUW (case insensitive)
matches the character with index 3210 (2016 or 408) literally (case insensitive)
3rd Capturing Group
([0-9][ABD-HJLNP-UW-Z]{2})
Match a single character present in the list below
[0-9]
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case insensitive)
Match a single character present in the list below
[ABD-HJLNP-UW-Z]
{2} matches the previous token exactly 2 times
AB
matches a single character in the list AB (case insensitive)
D-H matches a single character in the range between D (index 68) and H (index 72) (case insensitive)
JLN
matches a single character in the list JLN (case insensitive)
P-U matches a single character in the range between P (index 80) and U (index 85) (case insensitive)
W-Z matches a single character in the range between W (index 87) and Z (index 90) (case insensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"
gi

Test String