如何在python中使用正则表达式查找两个非字母数字字符之间的模式

Question

我对 python regex 很陌生。我无法清楚地了解如何在句子中搜索“*”，因为 * 在正则表达式中用作关键字，我感到很困惑。我的问题是，我有一个文件，其中：*CHI:   <that guy was> [//] that bunny was going to [: gonna] take that    balloon !%mor:   pro:dem|that n|bunny aux|be&PAST&13S part|go-PRESP    part|go-PRESP~inf|to v|take pro:dem|that n|balloon !所以在这里我必须检索“* CHI :”和“%mor”之间的句子我想要的输出应该是<that guy was> [//] that bunny was going to [: gonna] take that        balloon !

Answer 1

您可以使用该re.DOTALL标志来.匹配换行符；不需要环顾四周：

import re

s = '''*CHI:   <that guy was> [//] that bunny was going to [: gonna] take that

    balloon !

%mor:   pro:dem|that n|bunny aux|be&PAST&13S part|go-PRESP

    part|go-PRESP~inf|to v|take pro:dem|that n|balloon !

'''

print(re.search(r'\*CHI:   (.+)\n%mor:', s, re.DOTALL)[1])

输出：

<that guy was> [//] that bunny was going to [: gonna] take that

    balloon !

Answer 2

转义 '*' 字符：

re.findall(r'(?<=\*CHI:)[\s\S]*(?=%mor:)', s)

正向后视 '?<=' 和正向前瞻 '?=' 将修剪您的开始和结束条款。[\s\S] 将处理换行符。