Highlighting strings between [ and ] in lstlistings

Question

I want to use lstlisting to present a file like this:

#comment
[keyword]
key1=value1
key2=value with RegEx

[keyword:NewKeyword]
key1 = value1
key2=value with RegEx

and this is my language definition:

\lstdefinelanguage{myLang}{
    sensitive=false,
    morestring=[b]",
    keywords={=},
    morecomment=[l]{\#},
}

How can I extract [keyword] and [keyword:NewKeyword]?

Answer 1

I you want to highlight the words with the [...], you can use moredelim (as with myLangStyleA) which discards the delimiters and applies the given style. If you want to keep the brackets you can use morecomment (as with myLangStyleB)

\documentclass[border=2pt]{standalone}
\usepackage{xcolor}
\usepackage{listings}
\usepackage{filecontents}% only need to provide the file foo.mylang

\begin{filecontents*}{foo.mylang}% provide file foo.mylang
    #comment
    [keyword]
    key1=value1
    key2=value with RegEx

    [keyword:NewKeyword]
    key1 = value1
    key2=value with RegEx
\end{filecontents*}

\lstdefinelanguage{myLang}{
    sensitive=false,
    morestring=[b]",
    keywords={=},
    morecomment=[l]{\#},
}

\lstdefinestyle{myLangStyleA}{
    language=myLang,
    moredelim=[is][\color{blue}\ttfamily]{[}{]}
}

\lstdefinestyle{myLangStyleB}{
    language=myLang,
    morecomment=[s][\color{red}\ttfamily]{[}{]}, 
}

\begin{document}
    Using \textbf{style=myLangStyleA}:
    \lstinputlisting[style=myLangStyleA]{foo.mylang}

    Using \textbf{style=myLangStyleB}:
    \lstinputlisting[style=myLangStyleB]{foo.mylang}
\end{document}