XPath 与属性值的正则表达式匹配 [英] XPath with regex match on an attribute value

问题描述

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为了破解这个问题，我已经搜索和修改了几个小时，但我仍然遇到问题.我有以下 XML 数据:

I've searched and tinkered around for hours in an effort to crack this one, but I'm still having problems. I have the XML data below:

<game id="2009/05/02/arimlb-milmlb-1" pk="244539">
  <team id="109" name="Arizona" home_team="false">
    <event number="9" inning="1" description="Felipe Lopez doubles to left fielder Chris Duffy.  "/>
    <event number="15" inning="1" description="Augie Ojeda flies out to center fielder Mike Cameron.  "/>
    <event number="23" inning="1" description="Chad Tracy doubles to right fielder Joe Sanchez.  "/>
    <event number="52" inning="2" description="Mark Reynolds lines out to left fielder Chris Duffy.  "/>
    <!-- more data here -->
  </team>
</game>

我正在尝试获取在 description 属性的值中包含文本doubles"的事件节点的总数.这是我到目前为止一直在尝试的方法，但无济于事(irb 抛出错误):

I'm trying to get the total number of event nodes that contain the text ' doubles ' in the value of the description attribute. This is what I've been trying so far, to no avail (irb throws an error):

"/game/team/event/@description[matches(.,' doubles ')]"

因为我只是想匹配描述属性值的片段，所以可以使用 XPath 2.0 函数匹配"，对吗?如果是这样，我做错了什么?

Since I'm just trying to match a fragment of the value of the description attribute, it's possible to use the XPath 2.0 function 'matches', right? If so, what am I doing wrong?

提前感谢您的帮助！

推荐答案

我正在尝试获取总数包含文本的事件节点 'doubles ' 的值描述属性.

I'm trying to get the total number of event nodes that contain the text ' doubles ' in the value of the description attribute.

matches() 是一个标准的 XPath 2.0 函数.它在 XPath 1.0 中不可用.

您可以使用:

count(/*/*/event[contains(@description, ' doubles ')])

为了验证这一点，这里有一个小的 XSLT 转换，它只输出在提供的 XML 文档上评估上述 XPath 表达式的结果:

To verify this, here is a small XSLT transformation which just outputs the result of evaluating the above XPath expression on the provided XML document:

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output method="text"/>


 <xsl:template match="/">
  <xsl:value-of select=
  "count(/*/*/event[contains(@description, ' doubles ')])"/>
 </xsl:template>
</xsl:stylesheet>

当此转换应用于提供的 XML 文档时:

<game id="2009/05/02/arimlb-milmlb-1" pk="244539">
    <team id="109" name="Arizona" home_team="false">
        <event number="9" inning="1" description="Felipe Lopez doubles to left fielder Chris Duffy.  "/>
        <event number="15" inning="1" description="Augie Ojeda flies out to center fielder Mike Cameron.  "/>
        <event number="23" inning="1" description="Chad Tracy doubles to right fielder Joe Sanchez.  "/>
        <event number="52" inning="2" description="Mark Reynolds lines out to left fielder Chris Duffy.  "/>
        <!-- more data here -->
    </team>
</game>

产生想要的正确结果:

2

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