xconf-sample.conf

# default to '~'
xconf {

    echo '[~~[';

    echo \[~~[''xx;

    content_by_lua [~~[
        ngx.say'hello!'
    ]~~];

}

# the char between [
xconf '!' {
    content_by_lua [!![
        ngx.say'hello!'
    ]!!];
}

# if you give 42 as the sep, we will try match like this \[((.)\2*)\[ .*? \]\1\]
xconf 42 {
    echo [@@[
        ngx.say'hello!'
    ]@@];

    echo [##[
        local x = require 'x'
    ]##];

    echo [$$[
        ngx.print'abc'
    ]$$];

    echo [%%[
        ngx.print'abc'
    ]%%];

    echo [^^[
        ngx.print'abc'
    ]^^];

    echo [&&[
        ngx.print'abc'
    ]&&];

    echo [**[
        ngx.print'abc'
    ]**];

    echo [--[
        ngx.print'abc'
    ]--];

    echo [__[
        ngx.print'abc'
    ]__];

    echo [++[
        ngx.print'abc'
    ]++];

    echo [||[
        ngx.print'abc'
    ]||];

    echo [::[
        ngx.print'abc'
    ]::];

    echo [??[
        ngx.print'abc'
    ]??];
}