XSL：基于正则表达式将字符串拆分为标签

Question

I'm working in XSLT 2.0 and having trouble wrapping tags around parts of a string. Here's what I've got:

<dc:subject>Red&#xD;
            Green&#xD;
            Blue
</dc:subject>

and desired output:

<subject>
  <topic>Red</topic>
  <topic>Green</topic>
  <topic>Blue</topic>
</subject>

I know I can use substring-before() to grab anything before the divider, but I don't know how to use it recursively to get each instance before the divider; on the other hand, since I'm in 2.0 I can use replace() to hit all occurrences, but it won't accept an angle bracket so I can't just tell it to wrap each occurrence in the <topic> tags. What am I missing here?

<xsl:value-of select="replace(dc:subject, '.*&#xD;','????')"/>

or

<xsl:value-of select="substring-before(dc:subject, '&#xD;')"/>

Thank you!

Answer 1

You are creating new nodes here, so it is not the right approach to use replace which is purely about replacing strings with other strings.

You can use tokenize here to split the string, and then use xsl:for-each to create your new topic for each part

<subject>
  <xsl:for-each select="tokenize(dc:subject, '&#xD;')">
     <topic>
       <xsl:value-of select="normalize-space(.)" />
     </topic>
  </xsl:for-each>
</subject>