According to Product guide chapter 1.5.4 allowed signs are:
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| Component | Position | Allowed characters |
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| Routing Keys | 1 | A,C,D,E,F,H,K,N,P,R,T,V,W,X,Y |
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| Routing Keys | 2 | 0-9 |
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| Routing Keys | 3 | 0-9 with the exception of W for D6W |
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| Unique Identifier | 4 | 0-9, A,C,D,E,F,H,K,N,P,R,T,V,W,X,Y |
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| Unique Identifier | 5 | 0-9, A,C,D,E,F,H,K,N,P,R,T,V,W,X,Y |
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| Unique Identifier | 6 | 0-9, A,C,D,E,F,H,K,N,P,R,T,V,W,X,Y |
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| Unique Identifier | 7 | 0-9, A,C,D,E,F,H,K,N,P,R,T,V,W,X,Y |
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Every routing key must contain letter and two digits except ONE specific situation which is D6W
code.
So codes begening with A5W
, C6W
, V0W
are invalid.
According to chapter 1.5.1 Recommendations for Storage and Presentation
- An Eircode should always be stored as a single string of seven upper case characters in
IT systems, i.e. A65F4E2.
- An Eircode should always be presented in upper case as two parts separated by a space,
on stationary, mail items, computer forms, etc. i.e. A65 F4E2 and never A65F4E2.
Codes stored in database shouldn't be separated with space
or dash
, should be separated but only by space
and only for displaying.
Assuming, correct regex should looks like:
/([AC-FHKNPRTV-Y]\d{2}|D6W)[0-9AC-FHKNPRTV-Y]{4}/
Regex online tester
Ericode guide