tak dam priklad, neviem ci sa navzajom chapeme. mas napriklad riadok obsahujuci slova:
jedna dva tri pet
a chces vlozit slovo styri medzi tri a pet tak jednodcho nahradis retazec "tri" retazcom "tri styri "
pripadne by sa este dalo, ze by si si subor nacital do pola po riadkoch, nasiel urcity riadok a jednoducho doplnil zadany retazec (vo vacine jazykov je to pomocou operatora += alebo .=) a potom ulozil do suboru
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