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pinapple
2013 Mar 20
2
Pattern match
Hello again, in the help page of grep() function, it is written that
pattern:
character string containing a regular expression (or character string
for fixed = TRUE) to be matched in the given character vector. Coerced
by as.character to a character string if possible. If a character
vector of length 2 or more is supplied, the first element is used with
a warning. Missing values are allowed