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PN001

PN293

First two characters are PN followed by three single digit numbers.

PN\d{3}

GH001

HZ673

First two characters can now be any capital letter from the English alphabet.

[A-Z][A-Z]\d{3}

GHSTE001

Z999

Any number of capital letters plus three digits

[A-Z]+\d{3}

HJ.001

J.676

Any number of capital letters plus three digits separated by a full stop.

[A-Z]+\.\d{3}

AAB.346/GHT

AAB.346/AAA

Any number of capital letters plus three digits separated by a full stop followed by a slash and then three more capital letters.

[A-Z]+\.\d{3}/[A-Z]{3}

AAA.000/BBZ-Tz1

AAA.000/BBZ-AFz

Any number of capital letters plus three digits separated by a full stop followed by a slash and then three more capital letters followed by a dash and then three alphanumeric characters.

[A-Z]+\.\d{3}/[A-Z]{3}-\w{3}

ÄÜÖ.000/ÄÄÄ-AFz

ÄDD.111/ÄÄÄ-00e

Any number of Unicode capital letters plus three digits separated by a full stop followed by a slash and then three more Unicode capital letters followed by a dash and then three alphanumeric characters.

[[:upper:]]+\.\d{3}/[[:upper:]]{3}-\w{3}