web_techsystech/web_widget_pattern/demo/res_partner_views.xml

<?xml version="1.0" encoding="utf-8" ?>
<!-- Copyright 2024 Hunki Enterprises BV
     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl-3.0) -->
<data>
    <record id="view_partner_form" model="ir.ui.view">
        <field name="model">res.partner</field>
        <field name="inherit_id" ref="base.view_partner_form" />
        <field name="arch" type="xml">
            <xpath expr="//field[@name='street2']" position="attributes">
                <attribute name="pattern">[0-9]+</attribute>
            </xpath>
        </field>
    </record>
</data>