xml - XPath to find an element whose attribute contains a text, case-insensitively? -

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    <root> // other nodes     <a href="/patternframework/pages/logout.aspx?np=/sites/novatestsite/home.aspx" slick-uniqueid="92">sign out</a>     </root>

how write xpath returns a tag href contains "logout.aspx"?

for instance 

//a[@href[contains[., "logout.aspx"]]

case-sensitive:

//a[contains(@href,'logout.aspx')]

case-insensitive xpath 2.0:

//a[contains(lower-case(@href),'logout.aspx')]

case-insensitive xpath 1.0:

//a[contains(translate(@href, 'abcdefghijklmnopqrstuvwxyz', 'abcdefghijklmnopqrstuvwxyz'),'logout.aspx')]

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