sort by attribute text

Dear Friends,
I am suffering from a long night with my 5 year old who has strep.
Can someone have mercy on me and help me out with this dumb-dumb
question?

I just want to sort the elements of different names with different
attribute names by a substring in the attribute text (a number).

code below

thanks,
Mike F.

My XSL:
<xsl:template match="*">
 <xsl:for-each select=".">
  <xsl:sort select="@*[substring-after(., 'rr_target_2')]"
data-type="number"/>
 </xsl:for-each>
</xsl:template>

My XML:
<C ID="rr_target2_33">data...</C>
<C ID="rr_target2_34">data...</C>
<R TAR="rr_target2_33">data...</R>
<R TAR="rr_target2_34">data...</R>

What I would like in my output:
<C ID="rr_target2_33">data...</C>
<R TAR="rr_target2_33">data...</R>
<C ID="rr_target2_34">data...</C>
<R TAR="rr_target2_34">data...</R>

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