server-tools/base_field_validator/data/ir_model_regex_data.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record id="regex_mail" model="ir.model.fields.regex">
            <field name="regex">[^@]+@[^@]+\.[^@]+</field>
            <field name="name">Email</field>
        </record>
    </data>
</openerp>