Capturing url within text by using regex in xslt code

Question

This is my test input:

<license>
     <p>some text (http://creativecommons.org/licenses/by/3.0/) some text.</p>
</license>

Desired output:

<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
     <p>some text (http://creativecommons.org/licenses/by/3.0/) some text.</p> 
</license>

Basically I am trying to copy the url inside the text where license element does not contain the attribute xlink:href="http:// ******"> by looking in child <license-p> and move any URL up to the xlink:href attribute on the parent (license)

and here is my xslt:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xlink="http://www.w3.org/1999/xlink"

exclude-result-prefixes="xs"
version="3.0"> 
    <xsl:output method="html" encoding="UTF-8" indent="yes" />
    <xsl:strip-space elements="*"/>
    <xsl:template match="@*|node()">
        <xsl:copy>
            <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
    </xsl:template>
    <xsl:template match="license">
          <xsl:copy>
            <xsl:attribute name="xlink:href">                    
                <xsl:value-of select='replace(p,"[\s\S]*" ,"(\b(?:(?:https?|ftp):\/\/|www\.|ftp\.)(?:\([-A-Z0-9+&amp;@#\/%=~_|$?!:,.]*\)|[-A-Z0-9+&amp;@#\/%=~_|$?!:,.])*(?:\([-A-Z0-9+&amp;@#\/%=~_|$?!:,.]*\)|[A-Z0-9+&amp;@#\/%=~_|$]))")'/>
            </xsl:attribute> 
            <xsl:apply-templates/>
        </xsl:copy>
    </xsl:template>
    <xsl:template match="p/@xlink:href"/>   
</xsl:stylesheet>

The regex I am using is not working for saxon owing characters like?

I am allowed to use 3 functions with regex expressions. matches(), replace() and tokenize(). The purpose of replace() is to extract the uri from the whole text by replacing entire text content with uri. matches() returns true or false. and tokenize function splits a string based on a regular expression. I can also use analyze-string() instead of replace() — voyager
– voyager, Commented Jul 22, 2015 at 8:35
If you want to extract a certain substring matching a regular expression then you should consider using xsl:analyze-string instead of replace, see w3.org/TR/xslt20/#analyze-string — Martin Honnen
– Martin Honnen, Commented Jul 22, 2015 at 8:36
Also in the sample the URI is wrapped into (), can we assume that that is always the case? — Martin Honnen
– Martin Honnen, Commented Jul 22, 2015 at 8:40
No, I am afraid we cannot assume that the URI will always be wrapped into () — voyager
– voyager, Commented Jul 22, 2015 at 8:57

Adam Prescott · Accepted Answer · 2015-07-23 18:05:15Z

1

Ok folks, I know regex is far from perfect but the following works for me:

<xsl:analyze-string 
    select="$elValue"
    regex="((https?|ftp|gopher|telnet|file):(()|(\\\\))+[\\w\\d:#@%/;$()~_?\\+-=\\\\\\.&amp;]*\w*.\w*\W\w*\W\w*\W\d.\d\W)">                    
        <xsl:matching-substring>
            <xsl:value-of select="regex-group(1)"/>                       
        </xsl:matching-substring>
</xsl:analyze-string>

edited Jul 23, 2015 at 18:05

Adam Prescott

9451 gold badge8 silver badges20 bronze badges

answered Jul 23, 2015 at 15:35

voyager

112 bronze badges

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