[英]python regex: How can I have pattern searching for multiple pattern strings?
I have to search the following patterns in a file, (any match qualifies) 我必须在文件中搜索以下模式,(任何匹配都符合条件)
pattern_strings = ['\xc2d', '\xa0', '\xe7', '\xc3\ufffdd', '\xc2\xa0', '\xc3\xa7', '\xa0\xa0', '\xc2', '\xe9']
pattern = [re.compile(x) for x in pattern_strings]
and function using this 并使用此功能
def find_pattern(path):
with open(path, 'r') as f:
for line in f:
found = pattern.search(line)
if found:
logging.info('found - ' + found)
When I try using it 当我尝试使用它
find_pattern('myfile')
I see AttributeError: "'list' object has no attribute 'search'"
我看到
AttributeError: "'list' object has no attribute 'search'"
because patterns is 因为模式是
[<_sre.SRE_Pattern object at 0x107948378>, <_sre.SRE_Pattern object at 0x107b31c70>, <_sre.SRE_Pattern object at 0x107b31ce0>, <_sre.SRE_Pattern object at 0x107ac3cb0>, <_sre.SRE_Pattern object at 0x107b747b0>, <_sre.SRE_Pattern object at 0x107b74828>, <_sre.SRE_Pattern object at 0x107b748a0>, <_sre.SRE_Pattern object at 0x107b31d50>, <_sre.SRE_Pattern object at 0x107b31dc0>]
How can I have one pattern which looks for all strings in pattern_strings
? 如何在
pattern_strings
找到一个查找所有字符串的模式?
You could simply concatenate all the expressions together with a |
您可以简单地将所有表达式与
|
连接在一起 : :
pattern_strings = ['\xc2d', '\xa0', '\xe7', '\xc3\ufffdd', '\xc2\xa0', '\xc3\xa7', '\xa0\xa0', '\xc2', '\xe9']
pattern_string = '|'.join(pattern_strings)
pattern = re.compile(pattern_string)
This does, however, assume that none of your patterns are complicated enough that a simple concatenation like this might break. 但是,这确实假设您的模式都不够复杂,以至于这样的简单连接可能会破坏。 For the ones in your example, it should work.
对于您示例中的那些,它应该工作。 For more complex patterns, it may not.
对于更复杂的模式,它可能不会。
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