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s<-'hhaaappppyyyyyyy mmoooooorning friendsssssssssssssss, good goood day'
gsub('([[:alpha:]])\\1{2,}', '\\1\\1', s)

Success #stdin #stdout 0.23s 39420KB

stdin

Standard input is empty

stdout

[1] "hhaappyy mmoorning friendss, good good day"

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language:

R (R 3.5.2)

created:

visibility:

public

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