Check if a string is a word (alphabetic characters only)

This function tests whether the input string consists entirely of letters (a–z, A–Z) with no digits, punctuation, or special characters.

Usage

is_word(ch)

Arguments

ch

A character string or vector of strings to test.

Value

A logical vector the same length as ch, where each element is TRUE if the corresponding string consists only of letters, FALSE otherwise.

Examples

is_word("alpha")     # TRUE
#> [1] TRUE
is_word("123")       # FALSE
#> [1] FALSE
is_word("var_1")     # FALSE
#> [1] FALSE
is_word(c("a", "B", "C3"))  # TRUE, TRUE, FALSE
#> [1]  TRUE  TRUE FALSE