--- a/cws/pre_cw03.tex	Tue Nov 24 09:04:06 2020 +0000
+++ b/cws/pre_cw03.tex	Tue Nov 24 23:36:21 2020 +0000
@@ -55,6 +55,16 @@
 \end{lstlisting}%$
 
 
+\subsection*{Hints}
+
+\noindent
+\textbf{For the Preliminary Part:} useful operations for determining
+whether a string is a number are \texttt{.forall} and \texttt{.isDigit}.
+One way to calculate the the power operation is to use \texttt{.pow}
+on \texttt{BigInt}s, like \texttt{BigInt(n).pow(m).toInt}.
+\bigskip
+
+
 \subsection*{Preliminary Part (3 Marks, files postfix.scala, postfix2.scala)}
 
 The \emph{Shunting Yard Algorithm} has been developed by Edsger Dijkstra,

--- a/progs/lecture1.scala	Tue Nov 24 09:04:06 2020 +0000
+++ b/progs/lecture1.scala	Tue Nov 24 23:36:21 2020 +0000
@@ -482,6 +482,20 @@
 
 
 
+// Regular Expressions (the built in ones)
+
+val s = """Any so-called "politician" should respect a vote."""
+print(s)
+
+print("""foo""")
+
+val reg = """\d+""".r
+
+reg.findAllIn("bbbbaaabbbaaaccc").toList
+reg.replaceAllIn("bbbbaaabbbaaaccc", "*")
+reg.replaceAllIn("bbbb0aaa1bbba2aac3cc", "_")
+reg.replaceAllIn("bbbb00aaa11bbba232aac33cc", "_")
+
 
 // Further Information
 //=====================

--- a/progs/lecture2.scala	Tue Nov 24 09:04:06 2020 +0000
+++ b/progs/lecture2.scala	Tue Nov 24 23:36:21 2020 +0000
@@ -5,7 +5,6 @@
 // String Interpolations
 //=======================
 
-
 def cube(n: Int) : Int = n * n * n
 
 val n = 3

Binary file slides/slides03.pdf has changed

--- a/slides/slides03.tex	Tue Nov 24 09:04:06 2020 +0000
+++ b/slides/slides03.tex	Tue Nov 24 23:36:21 2020 +0000
@@ -354,6 +354,9 @@
 % \end{frame}
 % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+\begin{frame}<1-10>
+\end{frame}
+
 \end{document}