Hi Tommy65,
The patterns that you can set in Talend MDM are standard XSD facets that constraint the "xsd:string" type.
You'll find further information about it by looking for XML Regex, as defined by the W3C (
http://www.w3.org/TR/xmlschema11-2/#regexs).
All you have to do is to define a custom simple type, right-click on it and select 'edit pattern', and then enter your own regex.
I personally use a quick memo to build patterns :
http://www.xmlschemareference.com/regularExpression.html Enclosed, you'll find some screenshots on how to do.
