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Don't forget to use perl = TRUE when using this with grepl() and friends.
perl = TRUE
grepl()
ansi_regex()
String scalar, the regular expression.
Other low level ANSI functions: ansi_has_any(), ansi_hide_cursor(), ansi_string(), ansi_strip()
ansi_has_any()
ansi_hide_cursor()
ansi_string()
ansi_strip()