SDG/Config/Extensions.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<generators>
    <generator
        type="RedGate.SQLDataGenerator.ExpressionGenerators.Regexp.RegexpGenerator"
        name="Phone Extensions"
        description="3,123,1034,21,768..."
        category="Personal">
 
        <property name="Expression">[0-9]{1,3}</property>
 
        <matches field="extension" score="100" minlen="3"/>
        <matches field="extn" score="20" minlen="3"/>
 
        <type type="string"/>
    </generator>
</generators>