我想匹配仅包含定义字符的整个单词（或真正的字符串）。
例如，如果字母是d, o, g:
dog = match
god = match
ogd = match
dogs = no match (because the string also has an "s" which is not defined)
gods = no match
doog = match
gd = match
在这句话中：
dog god ogd, dogs o
...我希望能够匹配dog, god, and o (not ogd,因为逗号或dogs因为s)
这应该适合你
\b[dog]+\b(?![,])
解释
r"""
\b # Assert position at a word boundary
[dog] # Match a single character present in the list “dog”
+ # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
\b # Assert position at a word boundary
(?! # Assert that it is impossible to match the regex below starting at this position (negative lookahead)
[,] # Match the character “,”
)
"""
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