Driver Policy Condition match Regular Expression with Case Insensitive

I want to compare one attribute "tattributeTest" in condition with with Regular Expression (Case Insensitive).

For this I tried below policy condition but I don't know what should I do for Case Insensitive values check.

<policy>
<rule>
<description>Testing Purpose</description>
<comment xml:space="preserve">Test Policy</comment>
<conditions>
<and>
<if-class-name mode="nocase" op="equal">User</if-class-name>
<if-attr name="tattribute" op="not-available"/>
<if-attr mode="regex" name="tattributeTest" op="equal">Required|Process</if-attr>
</and>
</conditions>
<actions/>
</rule>
</policy>

I am using IDM 4.7.3.