[R] break up a string into strings with a fixed length

[J Chen]

dear all,

I have some very long strings and would like to break up each long string
into multiple strings with a fixed length, e.g. to break up

abcdefghijkl

into

abc, def, ghi, jkl

I tried a couple of commands but was not successful. Any help will be
appreciated.

Best,
Jimmy
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