Actually, you should spend your time reading the manuals for Readline library. For example here .
Once you understand, which facilities the library provides for interacting with the users input, you should be able to find appropriate front-end functions in Perl. I see there functions like rl_insert_text, rl_delete_text which lead me to belief, that it is possible to do what you want. But personally I've never tried to do it.
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