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check if a string is contained in a column R

whatever by MF on May 26 2020 Comment

str_detect("aecfg", letters)
grepl(letters,"aecfg")
# [1] TRUE
# Warning message:
#   In grepl(letters, "aecfg") :
#   argument 'pattern' has length > 1 and only the first element will be used
identical(str_detect("aecfg", letters),
          Vectorize(grepl,"pattern", USE.NAMES=FALSE)(letters,"aecfg")) # [1] TRUE

Source: www.rdocumentation.org

check if a string is contained in a column R

whatever by MF on May 26 2020 Comment

fruit <- c("apple", "banana", "pear", "pinapple")     # [1] TRUE
identical(str_detect(fruit, "a"), grepl("a",fruit))   # [1] TRUE
identical(str_detect(fruit, "^a"), grepl("^a",fruit)) # [1] TRUE
identical(str_detect(fruit, "a$"), grepl("a$",fruit)) # [1] TRUE
identical(str_detect(fruit, "b"), grepl("b",fruit))   # [1] TRUE
identical(str_detect(fruit, "[aeiou]"), grepl("[aeiou]",fruit)) # [1] TRUE

Source: www.rdocumentation.org

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