Regular expression not working

Hi,
I wonder if anyone knows why the regular expression in the line below

<xs:simpleType name="hrefURI">
        <xs:restriction base="xs:string">
            <xs:pattern
value="^/uiModel/resourceModel/cioRef\[@cioId='.+'\]/resource/@(content|tooltip|hyperLinkTarget|filter|mnemonic|alternateContent|keyboardShortcut|statusBarContent|icon)"/>
        </xs:restriction>
    </xs:simpleType>

does not much this fragment

content="/uiModel/resourceModel/cioRef[@cioId='output_text_component_2']/resource/@content"

  Thanks in advance,

   V.