[xsl] Function to Extract integer from string

Hello Everyone,

I have numerous xml documents that have content that refers to US code of
Federal Regulations (CFRs) e.g. 

'GENERAL [§21.197]' or 'PERMIT [§21.197 & §21.199]'

Is there a simple string function that extracts integers from a string?

I am trying to use a series of functions to do the same. e.g.

<xsl:for-each-group select="//Title" group-by=".">
        <xsl:if test="contains(., '§')">
                <xsl:variable name="before"
select="substring-after(.,'[')"/>
                <xsl:variable name="after"
select="substring-before($before,']')"/>
                <xsl:variable name="removespace" select="tokenize($after,
'&amp;')"/>
                <xsl:value-of select="$removespace"/>
                p/>     
        </xsl:if>
</xsl:for-each-group>

Which produces:

§21.197 
§21.197 §21.199 

Desired result:

21.197 
21.197 
21.199

I will eventually group and sort by number.

Any ideas?

Thanks

Phil




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