Pablo Rodriguez schrieb am 09.10.2020 um 16:31:
To improve your command and allow a space between both arguments you can use

\unexpanded\def\startswith
    {\dodoubleargument\dostartswith}

\def\dostartswith[#1][#2]%
    {...}
Now I see with \dosingleargument, \dodoubleargument and
\dotripleargument are there.

Which are the improvements to the command added by \do*argument?

You can add a space between both arguments. You version expects this

    \startswith [...][...]

while the extended code allows this

    \startswith [...] [...]

Wolfgang

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