Python：突出显示长字符串中的单词或短语

Question

我有一长串句子，我正在尝试使用 ANSI 颜色代码来突出显示匹配的字符串。输入不区分大小写，但我希望输出（即正匹配）保持区分大小写。

#!/usr/bin/env python3

from re import sub, IGNORECASE

red = '\033[31m'
nul = '\033[0m'

sentences = ["foo foo findme 123 bar bar",
             "foo findme foo bar 123 bar",
             "foo foo FindME 123 bar bar"]

for sentence in sentences:
    search_term = "findme 123"
    sentence = sub(search_term.replace(' ', '.*'), f'{red}{search_term}{nul}', sentence, flags=IGNORECASE)
    print(sentence)

当前输出：

foo foo findme 123 bar bar # this is good
foo findme 123 bar         # this is bad
foo foo findme 123 bar bar # this is bad

期望的输出：

foo foo findme 123 bar bar
foo foo FindME 123 bar bar

如何正确匹配区分大小写的字符串并防止误报破坏句子的某些部分？

我非常愿意使用 re 以外的库来解决这个问题，但通常更喜欢纯 python3 方法。

Answer 1

试试：

import re

red = "\033[31m"
nul = "\033[0m"

sentences = [
    "foo foo findme 123 bar bar",
    "foo findme foo bar 123 bar",
    "foo foo FindME 123 bar bar",
]

s = "findme 123"

for sentence in sentences:
    sentence = re.sub(
        r"\b({})\b".format(re.escape(s)),
        r"{}\1{}".format(red, nul),
        sentence,
        flags=re.I,
    )
    print(sentence)

打印（截图）：