A regex pattern to identify natural language English number phrases, such as
"one hundred and fifty" or "thirty-seven". Used internally by
replace_numbers to identify substrings to replace with their
decimal representation.
regex_numbersAn object of class character of length 1.
This is a PCRE (Perl type) regular expression, so it must be used with
perl = TRUE in base R regex functions. The packages stringr
and stringi are based on the alternative ICU regular expression
engine, so they cannot use this pattern.