regex_numbers: Regular expression to match numbers in English
In doseminer: Extract Drug Dosages from Free-Text Prescriptions

Description Usage Format Details Note Source

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.

1	regex_numbers

An 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.

There is limited support for fractional expressions like "one half". The original pattern did not support expressions like "a thousand", but it has been adapted to offer (experimental) support for this. Phrases like "million" or "thousand" with no prefix will not match.

https://www.rexegg.com/regex-trick-numbers-in-english.html

doseminer documentation built on July 19, 2021, 5:06 p.m.