Python:动态组合的正则表达式在findi中不起作用

Question

我想在一个句子中找到匹配的词，并动态地提供这个词。我编写了以下代码，可用于该示例：

text="Algorithmic detection of misinformation and disinformation Gricean perspectives"
found=re.finditer(r"\bdetection\b", text)
for i in found:
    print("found") #this line prints exactly once

但由于我需要目标单词作为输入，而这个输入是未知的，所以我更改了如下代码，它停止了工作：

text="Algorithmic detection of misinformation and disinformation Gricean perspectives"
word="detection" #or passed by other functions etc.
found=re.finditer(r"\b"+word+"\b", text)
for i in found:
    print("found") #this line does not print in this piece of code

我应该如何更正我的代码？谢谢

Answer 1

found=re.finditer(r"\b"+word+r"\b", text)
#         raw string here ___^

Answer 2

只需使用Raw f-strings：

text = "Algorithmic detection of misinformation and disinformation Gricean perspectives"
word = "detection"  # or passed by other functions etc.
pat = re.compile(fr"\b{word}\b")   # precompiled pattern
found = pat.finditer(text)
for i in found:
    print("found")