XSLT- Trying to negate a String() function

I have attached some XSLT code, the code is fairly repetitive in that a a template i have replaced with the comment   <!--DO STUFF1() --> is called in two places.

I think I could improve the code by using a negating my NOT condition, but I cant seem to make it work properly.

I want to try and say <xsl:when test="
string(substring-after(substring-after($path, '\'), '\')) ">  OR'ed with <xsl:when test="string(substring-after($path, '\')) ">


And help would be greatly received.

Even if its a complete restructure of the code.

Thanks

<xsl:choose>
		<xsl:when test="starts-with($path,'\')"> <!-- Starts with \ - e.g \abc\def\ghi -->
			<xsl:choose>
				<xsl:when test="not (string(substring-after(substring-after($path, '\'), '\'))) ">
					<!--DO STUFF1() -->
				</xsl:when>
				<xsl:otherwise>
					<xsl:call-template name="xxx">
						<xsl:with-param name="$path" select="substring-after(substring-after($path, '\'), '\')"/>
					</xsl:call-template>
				</xsl:otherwise>
			</xsl:choose>
		</xsl:when>
		<xsl:otherwise> <!-- Doesn't start with \ - e.g abc\def\ghi-->
			<xsl:choose>
				<xsl:when test="not (string(substring-after($path, '\'))) ">
					<!--DO STUFF1() -->
				</xsl:when>
				<xsl:otherwise>
					<xsl:call-template name="xxx">
						<xsl:with-param name="$path" select="substring-after($path, '\')"/>
					</xsl:call-template>
				</xsl:otherwise>
			</xsl:choose>
		</xsl:otherwise>
	</xsl:choose>

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