尽管歌词字符串中存在模式，但正则表达式错误显示一个空列表

Question

import relyrics = '''Twelve drummers drumming, eleven pipers pipingTen lords a leaping, nine ladies dancing, eight maids a milkingSeven swans a swimming, six geese a laying, five gold ringsFour calling birds, three French hensTwo turtle doves and a partridge in a pear tree'''xmasReExp = re.compile(r'\d+\s\w+')print(xmasReExp.findall(lyrics))

Answer 1

如果我理解正确，您想在文本中找到用单词写的数字lyrics。由于 RegEx 无法理解一个单词，因此您需要先解决该问题。为此，您可以：

• 创建从单词到数字的映射

• 在文本上应用映射

• 在新文本上使用正则表达式，以获取数字

样本

import re

# mapping

word_digit_map = {

    "one": 1,

    "two": 2,

    "three": 3,

    "four": 4,

    "five": 5,

    "six": 6,

    "seven": 7,

    "eight": 8,

    "nine": 9,

    "ten": 10,

    "eleven": 11,

    "twelve": 12,

}

lyrics = '''Twelve drummers drumming, eleven pipers piping

Ten lords a leaping, nine ladies dancing, eight maids a milking

Seven swans a swimming, six geese a laying, five gold rings

Four calling birds, three French hens

Two turtle doves and a partridge in a pear tree

'''

# apply mapping

for word in word_digit_map.keys():

    lyrics = lyrics.lower().replace(word, str(word_digit_map[word]))

# Use regex

xmasReExp = re.compile(r'\d+')

print(xmasReExp.findall(lyrics))

出去

['12', '11', '10', '9', '8', '7', '6', '5', '4', '3', '2']

Answer 2

结果是正确的，即一个空列表。\d表示数字，并且您在lyrics.