正则表达式匹配仅包含某些字符的整个单词

问题描述

我想匹配仅包含已定义字符的整个单词(或真正的字符串).

I want to match entire words (or strings really) that containing only defined characters.

例如如果字母是 d, o, g:

For example if the letters are 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

...我希望匹配 dog、god 和 o(不是 ogd、由于逗号或 dogs 由于 s)

...I would expect to match on dog, god, and o (not ogd, because of the comma or dogs due to the s)

推荐答案

这应该适合你

\b[dog]+\b(?![,])

说明

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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