testng_grouping.xml

<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd" >

<suite name="Suite1" verbose="1" >

    <test name="Regression1"   >
        <groups>
            <run>
                <!--include name="api"/-->
                <include name="regression.*"/>
                <!--exclude name="api"/-->
            </run>
        </groups>
        <classes>
            <class name="testNgLearning.dependsOn.Methods"/>
            <class name="testNgLearning.dependsOn.Group2"/>
        </classes>
    </test>


</suite>