xml - Output the difference in character XSLT -

i have 2 variables $word1 , $word2 , values are:

$word1 = 'america' $word2 = 'american' 

now using xslt have compare both variables , output difference in character.

for example output has 'n'. how in xslt 1.0??

i found function called index-of-string in xslt 2.0!!

depends on mean 'difference'. check if $word2 starts $word1 , return remaining part can do:

substring-after($word2,$word1) 

that returns 'n' in example.

if need check if $word1 appears anywhere within $word2 - , return parts of $word2 before/after $word1 have use recursive template:

<xsl:template name="substring-before-after">   <xsl:param name="prefix"/>   <xsl:param name="str1"/>   <xsl:param name="str2"/>   <xsl:choose>     <xsl:when test="string-length($str1)>=string-length($str2)">       <xsl:choose>         <xsl:when test="substring($str1,1,string-length($str2))=$str2">           <xsl:value-of select="concat($prefix,substring($str1,string-length($str2)+1))"/>         </xsl:when>         <xsl:otherwise>           <xsl:call-template name="substring-before-after">             <xsl:with-param name="prefix" select="concat($prefix,substring($str1,1,1))"/>             <xsl:with-param name="str1" select="substring($str1,2)"/>             <xsl:with-param name="str2" select="$str2"/>           </xsl:call-template>         </xsl:otherwise>       </xsl:choose>     </xsl:when>     <xsl:otherwise>       <xsl:text></xsl:text>     </xsl:otherwise>   </xsl:choose> </xsl:template> 

that call this:

<xsl:call-template name="substring-before-after">   <xsl:with-param name="prefix" select="''"/>   <xsl:with-param name="str1" select="$word2"/>   <xsl:with-param name="str2" select="$word1"/> </xsl:call-template> 

this return still 'n' in example, , returns 'an' if `$word1 = 'merica' etc..

note approach returns empty string if 2 strings identical , if second string not contained in first one. can modify returning kind of 'special' in second case modifying last otherwise:

     <xsl:otherwise>       <xsl:text>[special string]</xsl:text>     </xsl:otherwise>