Capturing url within text by using regex in xslt code -

this test input:

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

basically trying copy url inside text license element not contain attribute xlink:href="http:// ******"> looking in child <license-p> , move url xlink:href attribute on parent (license)

and here 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 using not working saxon owing characters like?

ok folks, know regex far perfect following works 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>