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Webharvest と xquery を使用して、Web サイトからデータを取得しています。

次のデータを持つ2つのxquery変数があります

$text:

<p> <strong>Psoria-Shield Inc.</strong> (<a href="http://www.psoria-shield.com/"></a><a href="/Tracker?data=gB90UgQvS9bs99znBBkklh-mudx4NTcPFIy_wiP7zUJ-qBXYABNid0GYgW4g7qVsjn3_dv2FPGzaYgKnhq_Ujg%3D%3D" target="_top">www.psoria-shield.com</a>) is a Tampa FL based company specializing in design, manufacturing, and distribution of medical devices to domestic and international
                  markets. PSI employs full-time engineering, production, sales staff, and manufactures within an ISO 13485 certified quality
                  system. PSI's flagship product, Psoria-Light&#174;, is FDA-cleared and CE marked and delivers targeted UV phototherapy for
                  the treatment of certain skin disorders. Psoria-Shield Inc., was acquired by Wellness Center USA Inc. ("WCUI") in August 2012,
                  and is now a wholly-owned subsidiary.
               </p> 
               <p> <strong>AminoFactory</strong> (<a href="http://www.aminofactory.com/"></a><a href="/Tracker?data=O0xbFRJiVuWDzRDq7SVwVR9xAPYLIGQyBw4mDziUrH4KB3DIYUasiO_O78eteJsv2doAGtg4kRhAqmnvkQ-9LA%3D%3D" target="_top">www.aminofactory.com</a>), a division of Wellness Center USA, Inc., is an online supplement store that markets and sells a wide range of high-quality
                  nutritional vitamins and supplements. By utilizing AminoFactory's online catalog, bodybuilders, athletes, and health conscious
                  consumers can choose and purchase the highest quality nutritional products from a wide array of offerings in just a few clicks.
               </p> 
                <pre>At Wellness Center Usa, Inc.
Tel: (847) 925-1885 <a href="/Tracker?data=rhuzXSqaPgDJ--ByIIMSm7wrtVUZmqiD7wl78d4gUHajkKceardtmAscrHABzvo360XXBJCWn_Rb_s-yPMVXTw_XJrSieD88bIXbE9snPn4%3D" target="_top">www.wellnescenterusa.com</a> Investor Relations Contact:
Arthur Douglas &amp; Associates, Inc.
Arthur Batson
Phone: 407-478-1120 <a href="/Tracker?data=9uKwR5tr9QwjFw830lvFTIWgz-s_eHaywZHwDl3el2RfYe5VuQZd_8sJU4J7HoFgOdyCn8br77RK60SIqLZkCy468cEKHpGUgE-nanwYfHo%3D" target="_top">www.arthurdouglasinc.com</a></pre> </span><span class="dt-green">

と$contact:

At Wellness Center Usa, Inc.
Tel: (847) 925-1885 <a href="/Tracker?data=rhuzXSqaPgDJ--ByIIMSm7wrtVUZmqiD7wl78d4gUHajkKceardtmAscrHABzvo360XXBJCWn_Rb_s-yPMVXTw_XJrSieD88bIXbE9snPn4%3D" target="_top">www.wellnescenterusa.com</a> Investor Relations Contact:
Arthur Douglas &amp; Associates, Inc.
Arthur Batson
Phone: 407-478-1120 <a href="/Tracker?data=9uKwR5tr9QwjFw830lvFTIWgz-s_eHaywZHwDl3el2RfYe5VuQZd_8sJU4J7HoFgOdyCn8br77RK60SIqLZkCy468cEKHpGUgE-nanwYfHo%3D" target="_top">www.arthurdouglasinc.com</a>

(上記のテキストは一例です。)

私がしたいのは、これまでのコンテンツを削除することです。$contactこれまでの$textところ、次のコードを思いつきました:

{
    for $x in $text
        return if(matches($contact, '')) then $x
            else if(matches($contact, $x)) then  '' else $x 
}

機能していません。どこが間違っているのかわかりません。これを行う正しい方法を教えてください。

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