python - 查找关键字符之间的单词模式

Question

尝试创建正则表达式来查找一个长字符串中的关键字，并且当关键字没有被字母包围时。如果字符串被破折号或下划线包围，只要它不被字母包围。只需要找到一个出现的词，才算匹配。只关心在一个长字符串中找到它。目前，当单词旁边有一个“_”时，我无法让它变为 True。有更好的表达方式吗？

编辑 - 我发现了一个案例，我需要它是真实的并且没有将它添加到示例中。

import re

key_words = ['go', 'at', 'why', 'stop' ]

false_match = ['going_get_that', 'that_is_wstop', 'whysper','stoping_tat' ]

positive_match = ['go-around', 'go_at_going','stop-by_the_store', 'stop','something-stop', 'something_stop']
pattern = r"\b(%s)\b" % '|'.join(key_words)

for word in false_match + positive_match:
    if re.match(pattern,word):
         print True, word
    else:
         print False, word

当前输出:

False going_get_that
False that_is_wstop
False whysper
False stoping_tat
True go-around
False go_at_going
True stop-by_the_store
True stop

编辑 - 这需要为真

  False something-stop
  False something_stop

期望的输出:

    False going_get_that
    False that_is_wstop
    False whysper
    False stoping_tat
    True go-around
    True go_at_going
    True stop-by_the_store
    True stop
    True something-stop
    True something_stop

Answer 1

使用消极的目光(向前|向后):

import re

key_words = ['go', 'at', 'why', 'stop' ]

false_match = ['going_get_that', 'that_is_wstop', 'whysper','stoping_tat' ]

positive_match = ['go-around', 'go_at_going','stop-by_the_store', 'stop', 'something-stop', 'something_stop']
pattern = r"(?<![a-zA-Z])(%s)(?![a-zA-Z])" % '|'.join(key_words)

for word in false_match + positive_match:
    if re.search(pattern,word):
         print True, word
    else:
         print False, word