diff --git a/cls2tex.sh b/cls2tex.sh
index 912ed23..351acb4 100755
--- a/cls2tex.sh
+++ b/cls2tex.sh
@@ -3,11 +3,11 @@
 # usage: cls2tex.sh INPUT OUTPUT PREFIX
 
 cat $1 \
-	| egrep '(^%$3|^\\\\edef\\\\$*@[A-Z][A-Z]+)' \
-	| sed 's/^\(\\\\edef\\\\\)$*@/%$3\\1/' \
-	| sed 's/%$3%%%% \(.*\)/%$3\\\\subsubsection{\1}\\\\label{subsubsec:\1}/' \
-	| sed 's/%$3%%% \(.*\)/%$3\\\\subsection{\1}\\\\label{subsec:\1}/' \
-	| sed 's/%$3%% \(.*\)/%$3\\\\section{\1}\\\\label{sec:\1}/' \
-	| sed 's/%$3\s\+>>\s\+\(.*\)/%$3\\\\begin{verbatim} \1 \\\\end{verbatim}/' \
+	| egrep '(^%'$3'|^\\edef\\.*@[A-Z][A-Z]+)' \
+	| sed 's/^\(\\edef\\\).*@/%'$3'\1/' \
+	| sed 's/%'$3'%%%% \(.*\)/%'$3'\\subsubsection{\1}\\label{subsubsec:\1}/' \
+	| sed 's/%'$3'%%% \(.*\)/%'$3'\\subsection{\1}\\label{subsec:\1}/' \
+	| sed 's/%'$3'%% \(.*\)/%'$3'\\section{\1}\\label{sec:\1}/' \
+	| sed 's/%'$3'\s\+>>\s\+\(.*\)/%'$3'\\begin{verbatim} \1 \\end{verbatim}/' \
 	| cut -c 3- - > $2