XSLT從xml文件中的所有URL中刪除查詢字符串

Question

我需要從MRSS RSS源中的所有屬性執行查詢字符串的正則表達式樣式替換，並將它們剝離爲url。我試過幾件事情在這裏使用從這裏提示：XSLT Replace function not found但無濟於事

<?xml version="1.0" encoding="utf-8"?> 
<rss xmlns:atom="http://www.w3.org/2005/Atom" xmlns:media="http://search.yahoo.com/mrss/" version="2.0"> 
<channel> 
<atom:link href="http://www.videojug.com/user/metacafefamilyandeducation/subscriptions.mrss" type="application/rss+xml" rel="self" /> 
<title>How to and instructional videos from Videojug.com</title> 
<description>Award-winning Videojug.com has over 50k professionally-made instructional videos.</description> 
<link>http://www.videojug.com</link> 
<item> 
    <title>How To Calculate Median</title> 
    <media:content url="http://direct.someurl.com/54/543178dd-11a7-4b8d-764c-ff0008cd2e95/how-to-calculate-median__VJ480PENG.mp4?somequerystring" type="video/mp4" bitrate="1200" height="848" duration="169" width="480"> 
    <media:title>How To Calculate Median</media:title> 
    .. 
    </media:content> 
</item> 

任何建議，真正幫助

Answer 1

如果您使用XSLT 2.0，您可以使用tokenize()：

<xsl:template match="media:content"> 
    <xsl:value-of select="tokenize(@url,'\?')[1]"/> 
    </xsl:template> 

這裏是唯一改變url屬性的media:content另一個例子：

<xsl:template match="media:content"> 
    <media:content url="{tokenize(@url,'\?')[1]}"> 
     <xsl:copy-of select="@*[not(name()='url')]"/> 
     <xsl:apply-templates/> 
    </media:content> 
    </xsl:template> 

編輯

要在您的實例句柄所有url屬性，並保留一切不變，使用恆等變換，只用一個模板覆蓋它@url。

這是您的示例XML的修改版本。我已經添加了兩個屬性description進行測試。應該保持attr屬性不變，並應該處理url屬性。

XML

<rss xmlns:atom="http://www.w3.org/2005/Atom" xmlns:media="http://search.yahoo.com/mrss/" version="2.0"> 
    <channel> 
    <atom:link href="http://www.videojug.com/user/metacafefamilyandeducation/subscriptions.mrss" type="application/rss+xml" rel="self"/> 
    <title>How to and instructional videos from Videojug.com</title> 
    <!-- added some attributes for testing --> 
    <description attr="don't delete me!" url="http://www.test.com/foo?anotherquerystring">Award-winning Videojug.com has over 50k professionally-made instructional videos.</description> 
    <link>http://www.videojug.com</link> 
    <item> 
     <title>How To Calculate Median</title> 
     <media:content url="http://direct.someurl.com/54/543178dd-11a7-4b8d-764c-ff0008cd2e95/how-to-calculate-median__VJ480PENG.mp4?somequerystring" type="video/mp4" bitrate="1200" height="848" 
     duration="169" width="480"> 
     <media:title>How To Calculate Median</media:title> 
     .. 
     </media:content> 
    </item> 
    </channel> 
</rss> 

XSLT

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:media="http://search.yahoo.com/mrss/"> 
    <xsl:output indent="yes"/> 
    <xsl:strip-space elements="*"/> 

    <!--Identity Transform--> 
    <xsl:template match="node()|@*"> 
    <xsl:copy> 
     <xsl:apply-templates select="node()|@*"/> 
    </xsl:copy> 
    </xsl:template> 

    <xsl:template match="@url"> 
    <xsl:attribute name="url"> 
     <xsl:value-of select="tokenize(.,'\?')[1]"/> 
    </xsl:attribute> 
    </xsl:template> 

</xsl:stylesheet> 

OUTPUT（使用撒克遜9.3.0.5）

<rss xmlns:atom="http://www.w3.org/2005/Atom" 
    xmlns:media="http://search.yahoo.com/mrss/" 
    version="2.0"> 
    <channel> 
     <atom:link href="http://www.videojug.com/user/metacafefamilyandeducation/subscriptions.mrss" 
       type="application/rss+xml" 
       rel="self"/> 
     <title>How to and instructional videos from Videojug.com</title> 
     <!-- added some attributes for testing --><description attr="don't delete me!" url="http://www.test.com/foo">Award-winning Videojug.com has over 50k professionally-made instructional videos.</description> 
     <link>http://www.videojug.com</link> 
     <item> 
     <title>How To Calculate Median</title> 
     <media:content url="http://direct.someurl.com/54/543178dd-11a7-4b8d-764c-ff0008cd2e95/how-to-calculate-median__VJ480PENG.mp4" 
         type="video/mp4" 
         bitrate="1200" 
         height="848" 
         duration="169" 
         width="480"> 
      <media:title>How To Calculate Median</media:title> 
     .. 
     </media:content> 
     </item> 
    </channel> 
</rss> 

Answer 2

字符串在XSLT 2.0中處理通常比使用XSLT 2.0更容易，但在這種情況下，使用自XSLT 1.0以來存在的substring-before（）函數可以很容易地實現要求。