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[xsl] How can I check the string is null or not using xslt

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Hai all
How can I check the string is null or not using xslt.I am new in xsl Please
help me
<a href="#">
</a>
I want  to check whether any string present after # symbol.

<xsl:if test="substring('#',2)//here I have to check for null//>
</xsl:if>

I would like to know the output of substring('#',2)


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