Checking ... ab123456c
could be a UK National Insurance : AB 12 34 56 C
probably not a UK bank sort code
probably not a UK HMRC VAT code
probably not a UK Postcode
probably not a UK Telephone
probably not an eMail
probably not a IP Address
probably not a IP4 Address
probably not a IP6 Address
probably not a MAC Address
probably not a Regular Expression
probably not a ISO 2 character country code
probably not a ISO 3 character country code
probably not a ISO 3166 numeric country code
probably not a US Telephone
probably not a US Zipcode