Python正则表达式如何匹配特殊字符串

Python正则表达式匹配特殊字符串

匹配特殊的字符串

匹配字符串中特定格式的字符串，在一串字符串中，先找到特殊规则的substring, 然后再提取相关的位置value

strings = ['result-2023-08-18-6g1s1ch-DB9909',             'result-2023-08-18-4g1s3ch-DB9909',           'result-2023-08-18-1g4s1ch-DB9909',           'result-2023-08-18-1g1s1ch-DB9909']pattern = r'(\d+)([Gg])(\d+)([Ss])(\d+)([Cc][Hh])' results = []for s in strings:    match = re.search(pattern, s)    if match:        print(match.group())        g = match.group(2)  #匹配第2个括号的内容        s = match.group(4)  #匹配第4个括号的内容        ch = match.group(6) #匹配第6个括号的内容        string = match.group(1) + g + match.group(3) + s + match.group(5) + ch        results.append(string)print(results)db_pattern = r'([Dd][Bb])(\d+)'match = re.search(db_pattern, strings[0])if match:    print(match.group())    db = match.group(1)      #匹配第2个括号的内容    number = match.group(2)  #匹配第4个括号的内容    db_number = db + number

输出内容

6g1s1ch
4g1s3ch
1g4s1ch
1g1s1ch
['6g1s1ch', '4g1s3ch', '1g4s1ch', '1g1s1ch']
DB9909

提取特殊的字符串

fullDump_pDevice00000286923A19B0_frame000_1g1s1ch.gfxbench_inst2_F535

pDevice后面可能是一串其他数字和字母，只需要截取从frame001开始的字符串，如：

frame000_1g1s1ch.gfxbench_inst2_F535

import res = "fullDump_pDevice00000286923A19B0_frame000_1g1s1ch.gfxbench_inst2_F535" # Match the prefix to removeprefix_pattern = r'^fullDump_pDevice\d+_'# Use sub() to remove the matched prefixresult = re.sub(prefix_pattern, '', s)print(result)

上述正则表达式并不能准确替换掉，输出结果还是原来的字符串：

fullDump_pDevice00000286923A19B0_frame000_1g1s1ch.gfxbench_inst2_F535

后使用如下表达式：

s = "fullDump_pDevice0000028fd3B19D0_frame000_1g1s1ch.gfxbench_inst2_F535" prefix_pattern = r'^fullDump_pDevice(\d+)([A-Za-z0-9]+)_'new = re.sub(prefix_pattern, "", s)print(new)

输出结果：