[DFDL-707] Strings are not restricted with the pattern facet - Jira

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If an element is a string that is restricted with the pattern facet, Daffodil ignores the restriction.

For example, Daffodil allows john,doe to be a valid LocalPart, even though the comma is not an allowed character.

<xsd:element dfdl:textStringPadCharacter="%SP;" name="LocalPart">

    <xsd:simpleType>

        <xsd:restriction base="xsd:string">

            <xsd:pattern value="[.A-Za-z0-9!#$%&amp;'*+-/=?^_`{|}~]+"/>

        </xsd:restriction>

    </xsd:simpleType>

</xsd:element>