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str <- "Hello World!" grepl("H", str) grepl("Hello", str) grepl("X", str)
x
str
<-
"Hello World!"
grepl
(
"H"
,
str
)
grepl
(
"Hello"
,
str
)
grepl
(
"X"
,
str
)
[1] TRUE
[1] TRUE
[1] FALSE
