--- a/progs/app4.scala	Fri Sep 25 07:35:37 2015 +0100
+++ b/progs/app4.scala	Fri Sep 25 08:51:12 2015 +0100
@@ -1,5 +1,4 @@
 val http_pattern = """"https?://[^"]*"""".r
-val my_urls = """urbanc""".r
 val email_pattern = 
   """([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})""".r
 

Binary file slides/slides01.pdf has changed

--- a/slides/slides01.tex	Fri Sep 25 07:35:37 2015 +0100
+++ b/slides/slides01.tex	Fri Sep 25 08:51:12 2015 +0100
@@ -211,7 +211,7 @@
 \end{tikzpicture}
 \end{column}
 \begin{column}{.5\textwidth}
-Us (after this course)\\\mbox{}\bigskip\\
+Us (after next lecture)\\\mbox{}\bigskip\\
 \begin{tikzpicture}[y=.08cm, x=.0003cm]
  	%axis
 	\draw (0,0) -- coordinate (x axis mid) (12000,0);
@@ -559,19 +559,28 @@
 \begin{frame}[t]
 \frametitle{\begin{tabular}{c}Regular Expressions\end{tabular}}
 
-Their inductive definition:\medskip
+Their inductive definition:
+
 
-\begin{textblock}{6}(2,5)
-  \begin{tabular}{rrl@ {\hspace{13mm}}l}
-  \bl{$r$} & \bl{$::=$}  & \bl{$\varnothing$}   & null\\
-           & \bl{$\mid$} & \bl{$\epsilon$}      & empty string / \pcode{""} / \pcode{[]}\\
-           & \bl{$\mid$} & \bl{$c$}             & character\\
-           & \bl{$\mid$} & \bl{$r_1 \cdot r_2$} & sequence\\
-           & \bl{$\mid$} & \bl{$r_1 + r_2$}     & alternative / choice\\
-           & \bl{$\mid$} & \bl{$r^*$}           & star (zero or more)\\
+\begin{textblock}{6}(2,7.5)
+  \begin{tabular}{@ {}rrl@ {\hspace{13mm}}l}
+  \bl{$r$} & \bl{$::=$}  & \bl{$\varnothing$}  & null\\
+         & \bl{$\mid$} & \bl{$\epsilon$}       & empty string / \pcode{""} / $[]$\\
+         & \bl{$\mid$} & \bl{$c$}                         & character\\
+         & \bl{$\mid$} & \bl{$r_1 + r_2$}  & alternative / choice\\
+         & \bl{$\mid$} & \bl{$r_1 \cdot r_2$} & sequence\\
+         & \bl{$\mid$} & \bl{$r^*$}            & star (zero or more)\\
   \end{tabular}
   \end{textblock}
   
+  
+\only<2->{\footnotesize
+\begin{textblock}{9}(2,0.5)
+\begin{bubble}[9.8cm]
+\lstinputlisting{../progs/app01.scala}
+\end{bubble}
+\end{textblock}}
+  
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
@@ -596,10 +605,10 @@
 \ldots are lists of characters. For example \code{"hello"}
 
 \begin{center}
-\bl{$[h, e, l, l, o]$}
+\bl{$[h, e, l, l, o]$} or just \bl{$hello$}
 \end{center}
 
-the empty string: $[]$ or \pcode{""}\bigskip\\
+the empty string: \bl{$[]$} or \bl{\pcode{""}}\bigskip\\
 
 the concatenation of two strings:
 
@@ -607,12 +616,45 @@
 \bl{$s_1 \,@\, s_2$}
 \end{center}
 
-\textit{foo $@$ bar = foobar}, \textit{baz $@\, []$ = baz}
+\bl{\textit{foo $@$ bar = foobar}, \textit{baz $@\, []$ = baz}}
   
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{Languages, Strings}
+
+\begin{itemize}
+\item \alert{\bf Strings} are lists of characters, for example
+\begin{center}
+\bl{$[]$},\;\bl{$abc$}  \hspace{2cm}(Pattern match: \bl{$c\!::\!s$})
+\end{center}\bigskip
+
+
+\item A \alert{\bf language} is a set of strings, for example\medskip
+\begin{center}
+\bl{$\{[], hello, \textit{foobar}, a, abc\}$}
+\end{center}\bigskip
+
+\item \alert{\bf Concatenation} of strings and sets
+
+\begin{center}
+\begin{tabular}{rcl}
+\bl{$\textit{foo}\;@\;bar$} & \bl{$=$} & \bl{$\textit{foobar}$}\medskip\\
+\bl{$A\;@\;B$} & \bl{$\dn$} & \bl{$\{ s_1\,@\,s_2 \;\mid\; s_1 \in A \wedge s_2 \in B\}$}
+\end{tabular}
+\end{center}
+
+%\item The \alert{\bf meaning} of a regular expression is a set of 
+%  strings, or language.
+\end{itemize}  
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \mode<presentation>{
 \begin{frame}[c]
 \frametitle{\begin{tabular}{c}The Meaning of a\\[-2mm] 
@@ -650,7 +692,11 @@
 \begin{center}
 \bl{$s \in L(r)$}\\ 
 \end{center}
-\end{bubble}
+\end{bubble}\bigskip\bigskip
+
+\ldots and the point of the next lecture is 
+to decide this problem as fast as possible (unlike Python,
+Ruby)
 
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
@@ -663,11 +709,14 @@
 \begin{itemize}
 \item Accounts for 75\%.\bigskip
 
-\item You will understand the question ``Is this relevant for
-      the exam?'' is very demotivating for the lecturer!\bigskip\\
+\item You will understand the question ``\textit{Is this relevant for
+      the exam?}'' is very demotivating for the lecturer!\bigskip\\
 
 \item Deal: Whatever is in the homework (and is not marked
-      ``optional'') is relevant for the exam.
+      ``\textit{optional}'') is relevant for the exam.\bigskip
+      
+\item Each lecture has also a handout. There are also handouts about
+notation and Scala.      
 \end{itemize}
 
 \end{frame}