Infopath throws error "only specific pattern allowed" when use regular expression for validation in schema

Question

This is MS info path question, I could not find specific forum for Info-Path So asking my question here
I am creating Info-Path form from schema. In the schema, the filename has restriction that it can only have extension .pdf or .PDF. But while filling out the form even if I type filename with extension ".pdf", I still see error "only
specific pattern allowed".
Below is my schema I used to create form
<?xml version="1.0" encoding="utf-8" ?>
<xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="Document">
<xs:complexType>
<xs:sequence>
<xs:element name="FileName" type="FileNameType"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:simpleType name ="FileNameType">
<xs:restriction base="xs:string">
<xs:pattern value="^.*\.(pdf|PDF)$"/>
<xs:minLength value="1" />
<xs:maxLength value="128" />
</xs:restriction>
</xs:simpleType>
</xs:schema>

Answer 1

Hi
This is the forum to discuss questions about Microsoft Office development. For your question, I recommend you post the question to the Answers forum for Infopath
Microsoft Community for​ InfoPath​
By the way, you can get support from here.  Support for Microsoft InfoPath
Thank you for your understanding.
Best Regards
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