How to use lstlisting package with regular expressions / special chars? - regex

Question

I want to show a php function with a regex in a code snippet using the lstlisting package. TeX gives me several errors "Package inputenc Error: Invalid UTF-8 byte sequence" and the dollar sign seems to put my tex code in math mode. The whole document is UTF-8 encoded. Any ideas how to correctly deal with these special chars in lstlisting environment? Thanks.
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{listings}
\begin{lstlisting}[language=php,label={lis:mylisting}]
public function passes($attribute, $value)
{
return preg_match("/^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[0-9])(?=.*?[#?!#()$%^&*=_{}[\]:;\"'|\\<>,.\/~`±§+-]).{8,255}$/", $value);
}
\end{lstlisting}

Answer 1

The problem is the plus-minus and section symbol. You can add specify them as literate:
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{listings}
\begin{document}
\begin{lstlisting}[language=php,label={lis:mylisting},extendedchars=true,literate={±}{{$\pm$}}1 {§}{{\S}}1]
public function passes($attribute, $value)
{
return preg_match("/^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[0-9])(?=.*?[#?!#()$%^&*=_{}[\]:;\"'|\\<>,.\/~`±§+-]).{8,255}$/", $value);
}
\end{lstlisting}
\end{document}