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This function escapes metacharacter, the characters that have special
meaning to the regular expression engine. In most cases you are better
off using fixed() since it is faster, but str_escape() is useful
if you are composing user provided strings into a pattern.
str_escape(string)A character vector the same length as string.
Input vector. Either a character vector, or something coercible to one.
str_detect(c("a", "."), ".")
str_detect(c("a", "."), str_escape("."))
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