Mistake in tokenizing under Saxon 8.2

Hello,

I presume that I have made a mistake somewhere in the stylesheet when
using the tokenize function under Saxon 8.2 - for some reason I am
loosing the whitespace chars around the matched regular expression.

For example, the following pattern:
text text [link,alt,link_text] text

should be transformed to:

text text <a href="link" alt="alt">link text</a> text

BUT

I am loosing the whitespasce characters around the <a> as follows:

text text<a href="link" alt="alt">link text</a>text
              ^                                                        
 ^
Why is this please? All the other whitespace chars are copied OK, even
though I am tokenising on whitespace.

If I use a &nbsp; in the stylesheet to compensate for the loss, it adds
two spaces, not one, which is wierd, so this is not currently a viable
solution.

Any input appreciated!

Many thanks,
Nic.

Appendix: Stylesheet Snippet

  <xsl:template match="/html/body/P|p">
    <!-- copy node plus select contents -->
    <xsl:copy>

              <xsl:variable name="tokens" select="tokenize(.,'\s+')"/>

              <xsl:for-each select="$tokens">

                <xsl:choose>
                  <xsl:when test='matches(.,"\[(.*),(.*),(.*)\]")'>

                    <xsl:variable name="elValue" select="."/>

                      <xsl:analyze-string select="$elValue"
regex="\[(.*),(.*),(.*)\]">

                        <xsl:matching-substring>
                          <a href="{regex-group(1)}">
                                  <xsl:attribute name='alt'>
                                    <xsl:value-of
select='replace(regex-group(3), "_"," ")'/>
                                  </xsl:attribute>
                                  <xsl:value-of
select='replace(regex-group(2), "_"," ")'/>
                           </a>
                        </xsl:matching-substring>

                      </xsl:analyze-string>

                  </xsl:when>
                  <xsl:otherwise>
                    <xsl:copy-of select="."/>
                  </xsl:otherwise>
                </xsl:choose>
              </xsl:for-each>
    </xsl:copy>
  </xsl:template>



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