David and Andrew,

With both of your suggestions it works perfect. BTW, what does
"'regex="\d+\.?\d*"' do?


I combined them as follows:

<xsl:for-each-group select="//Title" group-by=".">
	<xsl:if test="contains(., ''')">
		<xsl:variable name="all" select="replace(.,'[^
0-9\.]','')"/>
		<xsl:variable name="numbers" as="xs:string*">
			<xsl:analyze-string select="$all" regex="\d+\.?\d*">
				<xsl:matching-substring>
					<xsl:sequence select="."/>
					</xsl:matching-substring>
				</xsl:analyze-string>
			</xsl:variable>
			<xsl:for-each-group select="$numbers" group-by=".">
			<xsl:sort select="current-grouping-key()"/>
			<xsl:sequence select="."/>
			<p/>
		</xsl:for-each-group>
	</xsl:if>
</xsl:for-each-group>

Which produces the desired results:

21.197
21.197

21.199

91.407

121.133

Thanks, again. Now I'll figure out how to group them.

Phil

-----Original Message-----
From: Andrew Welch [mailto:andrew.j.welch@xxxxxxxxx]
Sent: Tuesday, October 24, 2006 8:24 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re:  Function to Extract integer from string

On 10/24/06, Philip Vallone <philip.vallone@xxxxxxxxxxx> wrote:
> 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.

How about:

	<xsl:variable name="numbers" as="xs:string*">
		<xsl:analyze-string select="//Title" regex="\d+\.?\d*">
			<xsl:matching-substring>
				<xsl:sequence select="."/>
			</xsl:matching-substring>
		</xsl:analyze-string>
	</xsl:variable>

	<xsl:for-each-group select="$numbers" group-by=".">
		<xsl:sort select="current-grouping-key()"/>
		<xsl:sequence select="."/>
	</xsl:for-each-group>

You might want to tight up the regex a little to not allow "2." for
example...

cheers
andrew