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python - 如何从文件加载多个正则表达式模式并匹配给定的字符串?

转载 作者:太空宇宙 更新时间:2023-11-04 04:12:27 25 4
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根据提供的代码(针对这篇文章进行了简化),有人可以帮助展示我如何获取正则表达式模式的列表(如果“列表”是要使用的正确类型)以从文本文件加载并匹配到一个字符串?

有许多从文件中加载文本/文本字符串并匹配正则表达式模式的示例,但反之则不然——许多正则表达式模式匹配一​​个文本字符串。

如果我手动创建列表并运行 re.compile,您可能会在代码中看到,我可以使用模式列表来匹配字符串。然而,从文件加载时,re.compile 适合什么位置?

import regex as re

fname = 'regex_strings_short.txt'

string_to_match = 'onload=alert'

# Create a manual list of regexes
manual_regexes = [
re.compile(r'(?i)\bHP\b(?:[^.,;]{1,20}?)\bnumber\b'),
re.compile(r'(?i)\bgmail\b(?:[^.,;]{1,20}?)\bnumber\b'),
re.compile(r'(?i)\bearthlink\b(?:[^.,;]{1,20}?)\bnumber\b '),
re.compile(r'(?i)onload=alert')
]

# Create a text file with these five example patterns
'''
(?i)\bHP\b(?:[^.,;]{1,20}?)\bnumber\b
(?i)\bgmail\b(?:[^.,;]{1,20}?)\bnumber\b
(?i)\bearthlink\b(?:[^.,;]{1,20}?)\bnumber\b
(?i)onload=alert
(?i)hello
'''

# Import a list of regex patterns from the created file
with open(fname, 'r') as file:
imported_regexes = file.readlines()

# Notice the difference in the formatting of the manual list with 'regex.Regex' and 'flags=regex.I | regex.V0' wrapping each item
print(manual_regexes)
print('---')
print(imported_regexes)

# A match is found in the manual list, but no match found in the imported list
if re.match(imported_regexes[3], my_string):
print('Match found in imported_regexes.')
else:
print('No match in imported_regexes.')

print('---')

if re.match(manual_regexes[3], my_string):
print('Match found in manual_regexes.')
else:
print('No match in manual_regexes.')

imported_regexes 没有匹配项,但 manual_regexes 有匹配项。

更新:下面的代码是对我有用的最终解决方案。发布它,因为它可能会帮助有人登陆这里并需要解决方案。

# You must use regex as re and not just 'import re' as \p{} is not correctly escaped

import regex as re



# Add the post/string to match below

my_string = '<p>HP Support number</p>'



fname = 'regex_strings.txt'



# Contents of text file similar to the below

# but without the leading # space - that's only because it's an inline comment here

# (?i)\bHP\b(?:[^.,;]{1,20}?)\bnumber\b

# (?i)\bgmail\b(?:[^.,;]{1,20}?)\bnumber\b

# (?i)】\b(?:[^.,;]{1,1000}?)\p{Lo}



# Import a list of regex patterns from a file

with open(fname, 'r', encoding="utf8") as f:

loaded_patterns = f.read().splitlines()



# print(loaded_patterns)

print(len(loaded_patterns))



found = 0

for index, pattern in enumerate (loaded_patterns):

if re.findall(loaded_patterns[index],my_string):

print('Match found. ' + loaded_patterns[index])

found = 1



if found == 0:

print('No matching regex found.')

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