# Enforce Address Postcode Validation

**LFS Version requirement:** v11.16 or later

The delivery address form in Limio For Salesforce validates the Postal/Zip Code field value against a Regular Expression from the Custom Metadata Type config.

The validation occurs in the Delivery Contact component, in the Delivery Postal Code field, and depends on the Country being selected.

<figure><img src="/files/OESWfmVGFCq6tLnd2jL7" alt=""><figcaption></figcaption></figure>

Because the post code validation depends on the country being selected, any given post code is considered invalid as long as country field is not populated.

<figure><img src="/files/7BNZsf4kR7gY9y9ycKyp" alt=""><figcaption></figcaption></figure>

NOTE: if the setting is left blank and no regular expression is specified, any post code is considered as valid for the country.

The form supports further customisation for adding a custom validation message specific to each country. In this case the custom message will appear as placeholder to the delivery postal code, to help the user inputting the code in a valid format from the start.

<figure><img src="/files/v1KZbn63jX9H1y8CnhNE" alt=""><figcaption></figcaption></figure>

If the format used is still invalid against the regex specified, the same validation message will appear as input field error message:

<figure><img src="/files/7IwtRz1fLLqQggY0664I" alt=""><figcaption></figcaption></figure>

In order to update the regular expression and the corresponding validation message, follow the instructions below:

1. In the Setup search box, look for the Custom Metadata Types and click 'Manage Records' on the **Region** type.<br>

   <figure><img src="/files/uisBt2ifYtusLSrbp0LI" alt=""><figcaption></figcaption></figure>
2. Find a region of interest and click 'Edit'.<br>

   <figure><img src="/files/iWHJgzej0BQWRqJ42m7G" alt=""><figcaption></figcaption></figure>
3. Find the **Address Validation** field and populate a **'zip'** property of the object inside with the relevant Regular Expression.<br>

   <figure><img src="/files/lfEtz8jAQMoGZX9LN04B" alt=""><figcaption></figcaption></figure>
4. In the same **Address Validation** filed, add (or edit) the property '**invalid\_code\_msg'** with the relevant message.<br>

   <figure><img src="/files/w5CLbzRyxQnywbSjpwfs" alt=""><figcaption></figcaption></figure>
5. Save the record.

As an example, the Address Validation can be populated as follows for United Kingdom post codes.

```
{
"posturl": "http://www.royalmail.com/postcode-finder",
"require": "ACZ",
"key": "GB",
"name": "UNITED KINGDOM",
"id": "data/GB",
"locality_name_type": "post_town",
"zipex": "EC1Y 8SY,GIR 0AA,M2 5BQ,M34 4AB,CR0 2YR,DN16 9AA,W1A 4ZZ,EC1A 1HQ,OX14 4PG,BS18 8HF,NR25 7HG,RH6 0NP,BH23 6AA,B6 5BA,SO23 9AP,PO1 3AX,BFPO 61",
"fmt": "%N%n%O%n%A%n%C%n%Z",
"zip": "GIR ?0AA|(?:(?:AB|AL|B|BA|BB|BD|BH|BL|BN|BR|BS|BT|BX|CA|CB|CF|CH|CM|CO|CR|CT|CV|CW|DA|DD|DE|DG|DH|DL|DN|DT|DY|E|EC|EH|EN|EX|FK|FY|G|GL|GY|GU|HA|HD|HG|HP|HR|HS|HU|HX|IG|IM|IP|IV|JE|KA|KT|KW|KY|L|LA|LD|LE|LL|LN|LS|LU|M|ME|MK|ML|N|NE|NG|NN|NP|NR|NW|OL|OX|PA|PE|PH|PL|PO|PR|RG|RH|RM|S|SA|SE|SG|SK|SL|SM|SN|SO|SP|SR|SS|ST|SW|SY|TA|TD|TF|TN|TQ|TR|TS|TW|UB|W|WA|WC|WD|WF|WN|WR|WS|WV|YO|ZE)(?:\\d[\\dA-Z]? ?\\d[ABD-HJLN-UW-Z]{2}))|BFPO ?\\d{1,4}",
"upper": "CZ",
"invalid_code_msg": "For UK use format AB1 CD2"
}
```


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