Obtain the length of the longest substring containing only 'letter'
This function accepts a character vector and computes the length of the
longest substring containing only
letter for each element of
Character vector of length 1, containing one single character.
The elements of
x can be in upper case, lower case
or mixed. NAs are handled.
An integer vector of the same length as
v = c("AAACTGTGFG", "GGGAATT", "CCAAAAAAAAAATT") longestConsecutive(v, "A")