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+\documentclass{minimal}
+\usepackage{substr}
+\def\str{hellohello}
+\def\longstr{hellohellohellohello}
+\def\medstr{hellohellohello}
+\def\substr{ell}
+\def\subSTR{ELL}
+
+\newcounter{appearances}
+\begin{document}
+
+\bigskip{\bfseries IfSubStringInString}
+
+\IfSubStringInString{\substr}{\str}{``\subSTR'' is in ``\str''}{Error}
+
+\IfSubStringInString{\subSTR}{\str}{Error}{No ``\subSTR'' in ``\str''}
+
+
+\bigskip{\bfseries BeforeSubString and BehindSubString}
+
+Text befor ``\substr'' in ``\str'':
+\BeforeSubString{\substr}{\str}
+
+Text after ``\substr'' in ``\str'':
+\BehindSubString{\substr}{\str}
+
+\BeforeSubString{\substr}{\str}%
+\emph{\bfseries\substr}%
+\BehindSubString{\substr}{\str}
+
+
+\bigskip{\bfseries CountSubStrings}
+
+Count of ``\substr'' in ``\str'':
+\CountSubStrings{\substr}{\str}
+
+Count of ``\substr'' in ``\medstr'':
+\CountSubStrings{\substr}{\medstr}
+
+Count of ``\substr'' in ``\longstr'':
+\CountSubStrings{\substr}{\longstr}
+
+
+\bigskip{\bfseries SubStringsToCounter}
+
+\SubStringsToCounter{appearances}{\substr}{\str}%
+Count of ``\substr'' in \str'' (counter):
+\theappearances
+
+\end{document}