使用XSLT，如何在.NET项目中使用变量将属性与正则表达式匹配？

Question

I am working on a .NET project which converts an xml file into a different format using XSLT.

I have original xml like this (this is just the relevant section):

<video>
    <part ids="pt1">
        <title>Title1</title>
    </part>
    <part ids="pt2 pt3">
        <title>Title2</title>
    </part>
    <part ids="pt4">
        <title>Title3</title>
    </part>
</video>

In my xslt file I have a variable $partid which is set fine as something like pt2 . I then wanted to use this to find the <title> within the <part> which contained the variable $partid in the attribute ids .

I was doing this originally with the following:

<xsl:value-of select="/video/part[contains(@ids, $partid)]/title"/>

However, I have now realised this runs into problems if the $partid is something like pt1 but there exists a <part> element with ids as pt12 as well as a <part> element with ids as pt1 . As this will match both.

I thought I could just swap it to use matches() instead of contains() and use a regex like this:

matches(@ids, '(^'+$partId+' | '+$partId+' | '+$partId+'$ |^'+$partId+'$)')

However, it seems I'm restricted to XSLT 1.0 which does not allow matches() . Any ideas on how I could proceed with this?

Many thanks.

Answer 1

There is no regex support in XSLT 1.0. To eliminate the ambiguity between pt1 and pt 12 , you can do:

<xsl:value-of select="/video/part[contains(concat(' ', @ids, ' '), concat(' ', $partid, ' '))]/title"/>

A better solution would be upstream of you: there's really little point in using XML that way.