problems with contain function

["vara prasad babu vegesine" <vegesine@xxxxxxxxxxx>]

Hi,

I am trying to test a condition with contains() function . But for some 
reason it doesn't allow variables as its parameters.
I am usning xalan java from apache as xslt processor.

<xsl:template match=".//UserDefined">
<xsl:variable name="fieldName" select="label"/>
<xsl:if test="not(contains($fieldName,'sast box ahn route'))">
	.....
       ....
</xsl:if>
</xsl:template>

for some reason it is validating $fieldName as constant.

is there anyway I can make it to treat as a variable

Thanks
vara
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