https://www.infopathdev.com:443/forums/41.aspxIf you're not sure where to ask your question, ask it here. If necessary, our moderators will make sure it gets classified in the correct board.enCommunityServer 2007 SP3 (Build: 31118.962)https://www.infopathdev.com:443/forums/thread/103102.aspxFri, 03 Jul 2015 13:17:02 GMT033a2e2d-04e2-4a9d-be01-a4634161eefd:103102Steven_Smith0https://www.infopathdev.com:443/forums/thread/103102.aspxhttps://www.infopathdev.com:443/forums/commentrss.aspx?SectionID=41&PostID=103102<p>&nbsp;So after searching the internet for a considerable amount of time to try to find the right way to validate UK postcodes to a fairly accurate dataset I have come up with the following solution. For reference the field containing my postcode is called Postcode.<br /></p> <p>&nbsp;Using the formatting conditions input the following:</p> <table> <tr> <td>Field</td> <td>Match Type</td> <td>Condition</td> </tr> <tr> <td>Postcode</td> <td>does not match pattern</td> <td>[A-PR-UWYZ][A-HK-Y]?[0-9]{1,2} ?[0-9][ABD-HJLNP-UW-Z]{2}</td> </tr> <tr> <td>Postcode</td> <td>does not match pattern</td> <td>[A-PR-UWYZ][0-9][A-HJKSTUW] ?[0-9][ABD-HJLNP-UW-Z]{2}</td> </tr> <tr> <td>Postcode</td> <td>does not match pattern</td> <td>[A-PR-UWYZ][A-HK-Y][0-9][CDFGI-LOQSTUZ] ?[0-9][ABD-HJLNP-UW-Z]{2}</td> </tr> <tr> <td>Postcode</td> <td>is equal to</td> <td>GIR 0AA</td> </tr> </table> <p>All these should end with an &quot;and&quot;. Use custom pattern to insert the conditions for pattern matching.<br /></p><p>There are a lot of RegEx examples out there, however InfoPath doesn&#39;t fully support it. If anyone has a better solution than this I would be interested to hear it, as this isn&#39;t the most elegant of solutions.<br /></p>