diff -r d8dbf91c149b -r 4edc1a308652 cws/main_cw05.tex
--- a/cws/main_cw05.tex	Mon Jan 03 00:59:32 2022 +0000
+++ b/cws/main_cw05.tex	Sun Jan 09 01:06:30 2022 +0000
@@ -470,7 +470,7 @@
   implement this command by writing 0 to \pcode{mem(mp)}, that is use
   \pcode{write(mem, mp, 0)} as the rule for the command \texttt{0}.
   The easiest way to modify a string in this way is to use the regular
-  expression \pcode{"""[^<>+-.\\[\\]]"""}, which recognises everything that is 
+  expression \pcode{"""[^<>+\\-.\\[\\]]"""}, which recognises everything that is 
   not a bf-command. Similarly, the
   regular expression \pcode{"""\\[-\\]"""} finds all occurrences of \pcode{[-]}.  By using the Scala method \pcode{.replaceAll} you can replace substrings
   with new strings.\\