StackOverflowException when parsing against a schema with a pattern
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                 Key: XERCESJ-1326
                 URL: https://issues.apache.org/jira/browse/XERCESJ-1326
             Project: Xerces2-J
          Issue Type: Bug
          Components: XML Schema 1.0 Datatypes
    Affects Versions: 2.9.1
         Environment: All
            Reporter: George Cristian Bina


The following document when parsed against the schema below generates a stack 
overflow:

testPattern.xml

<?xml version="1.0" encoding="UTF-8"?>
<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
 xsi:noNamespaceSchemaLocation="testPattern.xsd">ab</root>

testPattern.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";>
    <xs:element name="root">
        <xs:simpleType>
            <xs:restriction base="xs:string">
                <xs:pattern value="(a|)+"/>
            </xs:restriction>
        </xs:simpleType>
    </xs:element>
</xs:schema>


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