Add mtd_is_valid_fmt() #143
Merged
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This function checks that the specified item, such as a NINO, business id, tax year, savings account name etc is in the correct format (not necessarily that they are actually valid).
Note: The postcode check isn't a strict postcode format check, it just checks against what HMRC says is valid for a postcode. E.g. from https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/property-business-api/6.0/oas/page#tag/Annual-Submissions/paths/~1individuals~1business~1property~1uk~1%7Bnino%7D~1%7BbusinessId%7D~1annual~1%7BtaxYear%7D/put
From the "Request Body schema"
ukProperty -> allowances -> structuredBuildingAllowance -> building ->
postcode
Use like
bool ok;
ok = mtd_is_valid_fmt(MTD_VLDT_FMT_NINO, "AB283902D");
...