我正在尝试使用Python中的正则表达式来匹配所有连续的大写单词/短语。鉴于以下情况:
text = "The following words are ALL CAPS. The following word is in CAPS."
代码将返回:
ALL CAPS, CAPS
我目前正在使用:
matches = re.findall('[A-Z\s]+', text, re.DOTALL)
但这返回:
['T', ' ', ' ', ' ', ' ALL CAPS', ' T', ' ', ' ', ' ', ' ', ' CAPS']
我显然不想要标点符号或“T”。我只想返回连续的单词或仅包含所有大写字母的单个单词。
Thanks
这个可以完成以下工作:
import re
text = "tHE following words aRe aLL CaPS. ThE following word Is in CAPS."
matches = re.findall(r"(\b(?:[A-Z]+[a-z]?[A-Z]*|[A-Z]*[a-z]?[A-Z]+)\b(?:\s+(?:[A-Z]+[a-z]?[A-Z]*|[A-Z]*[a-z]?[A-Z]+)\b)*)",text)
print matches
Output:
['tHE', 'aLL CaPS', 'ThE', 'Is', 'CAPS']
解释:
( : start group 1
\b : word boundary
(?: : start non capture group
[A-Z]+ : 1 or more capitals
[a-z]? : 0 or 1 small letter
[A-Z]* : 0 or more capitals
| : OR
[A-Z]* : 0 or more capitals
[a-z]? : 0 or 1 small letter
[A-Z]+ : 1 or more capitals
) : end group
\b : word boundary
(?: : non capture group
\s+ : 1 or more spaces
(?:[A-Z]+[a-z]?[A-Z]*|[A-Z]*[a-z]?[A-Z]+) : same as above
\b : word boundary
)* : 0 or more time the non capture group
) : end group 1
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