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Regular Expression to Validate UK Number Plates

Regular Expression to Validate UK Number Plates

Regular Expression

(?<Current>^[A-Z]{2}[0-9]{2}[A-Z]{3}$)|(?<Prefix>^[A-Z][0-9]{1,3}[A-Z]{3}$)|(?<Suffix>^[A-Z]{3}[0-9]{1,3}[A-Z]$)|(?<DatelessLongNumberPrefix>^[0-9]{1,4}[A-Z]{1,2}$)|(?<DatelessShortNumberPrefix>^[0-9]{1,3}[A-Z]{1,3}$)|(?<DatelessLongNumberSuffix>^[A-Z]{1,2}[0-9]{1,4}$)|(?<DatelessShortNumberSufix>^[A-Z]{1,3}[0-9]{1,3}$)|(?<DatelessNorthernIreland>^[A-Z]{1,3}[0-9]{1,4}$)

Source information

DVLA website

Rules

Current

It consists of two letters, followed by two numbers that help identify the age of the vehicle, and three letters at the end.

Prefix

It consists of one letter that helps identify the age of the vehicle, followed by one, two or three numbers, and three letters at the end.

Suffix

It consists of three letters, followed by one, two or three numbers, and a single letter at the end that helps identify the age of the vehicle.

Dateless

It can consist of up to four numbers followed by up to three letters, or vice versa. The maximum number of characters is six.

A dateless plate could be more formally described as four alternative rules:

  1. Long Number Prefix: It can consist of up to four numbers followed by up to two letters.
  2. Short Number Prefix: It can consist of up to three numbers followed by up to three letters.
  3. Long Number Suffix: It can consist of up to two letters followed by up to four numbers.
  4. Short Number Suffix: It can consist of up to three letters followed by up to three numbers.

Northern Ireland

Northern Ireland style registrations also fall within the dateless range. These consist of three letters followed by up to four numbers. All Northern Ireland registrations contain either the letter I or Z.

Validation Examples

== Valid Current Style ==
AB51ABC
-- Invalid Current Style --
- Missing First Letter = Prefix e.g. A51ABC
- Extra First Letter -
ABC54ABC
- Missing Number -
AB5ABC
- Extra Number -
AB543ABC
- Missing Last Letter -
AB54AB
- Extra Last Letter -
AB54ABCD
== Valid Prefix ==
A123ABC
A12ABC
A1ABC
-- Invalid Prefix --
- Missing First Letter = Dateless e.g. 123ABC
- Extra First Letter -
AB1ABC
- Missing Numbers -
AABC
- Extra Numbers -
A1234ABC
- Missing Last Letter -
A1AB
- Extra Last Letter -
A1ABCD
== Valid Suffix ==
ABC123A
ABC12A
ABC1A
-- Invalid Suffix --
- Missing First Letter -
AB1A
AB123A
- Extra First Letter
ABCD1A
ABCD123A
- Missing Numbers -
ABCA
- Extra Numbers -
ABC1234A
- Missing Last Letter = Dateless e.g. ABC123
- Extra Last Letter -
ABC1AB
== Valid Dateless ==
1ABC
ABC1
1234A
A1234
1234AB
AB1234
123ABC
ABC123
-- Invalid Dateless --
- Missing Numbers -
ABC
- Extra Numbers -
12345A
A12345
- Missing Letters -
1
123
1234
- Extra Letters
1ABCD
ABCD1
- More than 6 characters -
1234ABC
ABC1234
@boolie205

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@boolie205 boolie205 commented Jun 28, 2019

Thanks for this, absolute life saver

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