Fix stupid typo in example.

Doc/lib/libre.tex

@@ -285,7 +285,7 @@ likely want to use the \function{search()} function rather than the
 
 \begin{verbatim}
 >>> import re
->>> m = re.search('(?<=abc)def', 'abdef')
+>>> m = re.search('(?<=abc)def', 'abcdef')
 >>> m.group(0)
 'def'
 \end{verbatim}