This seems the fail-safe one
\define substr(string, start:0, length)
<$vars Length={{{ [[$length$]!is[blank]then[$length$]]~[[$string$]length[]]
}}} >
<$text text={{{ [<__string__>split[]butfirst<__start__>first<Length>join[]]
}}} />
</$vars>
\end
See these examples:
# <<substr>>
# <<substr string:"Test">>
# <<substr start:1>>
# <<substr length:2>>
# <<substr string:"Test" length:2>>
# <<substr string:"Test" start:1 length:2>>
# <<substr string:"Test" start:-4 length:2>>
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