spaCy/spacy/lang/en/lex_attrs.py

from ...attrs import LIKE_NUM

# fmt: off
_num_words = [
    "zero", "one", "two", "three", "four", "five", "six", "seven", "eight",
    "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen",
    "sixteen", "seventeen", "eighteen", "nineteen", "twenty", "thirty", "forty",
    "fifty", "sixty", "seventy", "eighty", "ninety", "hundred", "thousand",
    "million", "billion", "trillion", "quadrillion", "gajillion", "bazillion"
]
_ordinal_words = [
    "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth",
    "ninth", "tenth", "eleventh", "twelfth", "thirteenth", "fourteenth",
    "fifteenth", "sixteenth", "seventeenth", "eighteenth", "nineteenth",
    "twentieth", "thirtieth", "fortieth", "fiftieth", "sixtieth", "seventieth",
    "eightieth", "ninetieth", "hundredth", "thousandth", "millionth", "billionth",
    "trillionth", "quadrillionth", "gajillionth", "bazillionth"
]
# fmt: on


def like_num(text):
    if text.startswith(("+", "-", "±", "~")):
        text = text[1:]
    text = text.replace(",", "").replace(".", "")
    if text.isdigit():
        return True
    if text.count("/") == 1:
        num, denom = text.split("/")
        if num.isdigit() and denom.isdigit():
            return True
    text_lower = text.lower()
    if text_lower in _num_words:
        return True
    # Check ordinal number
    if text_lower in _ordinal_words:
        return True
    if text_lower.endswith(("st", "nd", "rd", "th")):
        if text_lower[:-2].isdigit():
            return True
    return False


LEX_ATTRS = {LIKE_NUM: like_num}