![\"python](\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/25074954\/ed0fc4e6-ac1b-4a19-8d04-a4b705077560.webp\")
<\/p>\n<\/p>\n
\u5728Python\u4e2d\u5339\u914d\u70b9\uff08.\uff09\u5b57\u7b26\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\uff08regex\uff09\u6765\u5b9e\u73b0\u3002\u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\uff0c\u70b9\u5b57\u7b26\u5177\u6709\u7279\u6b8a\u542b\u4e49\uff0c\u8868\u793a\u5339\u914d\u4efb\u610f\u5355\u4e2a\u5b57\u7b26<\/strong>\u3002\u5982\u679c\u60f3\u8981\u5339\u914d\u4e00\u4e2a\u5b9e\u9645\u7684\u70b9\u5b57\u7b26\uff0c\u5fc5\u987b\u5bf9\u5176\u8fdb\u884c\u8f6c\u4e49\uff0c\u5373\u5728\u70b9\u5b57\u7b26\u524d\u52a0\u4e0a\u53cd\u659c\u6760\uff08\\\uff09\u3002Python\u63d0\u4f9b\u4e86 \u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u7528\u4e8e\u63cf\u8ff0\u548c\u5339\u914d\u5b57\u7b26\u4e32\u6a21\u5f0f\u7684\u5f3a\u5927\u5de5\u5177\u3002\u5728Python\u4e2d\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u901a\u8fc7 \u7531\u4e8e\u70b9\uff08.\uff09\u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u662f\u4e00\u4e2a\u7279\u6b8a\u5b57\u7b26\uff0c\u56e0\u6b64\u5982\u679c\u60f3\u8981\u5339\u914d\u5b9e\u9645\u7684\u70b9\u5b57\u7b26\uff0c\u9700\u8981\u5728\u70b9\u524d\u52a0\u4e0a\u53cd\u659c\u6760\uff08\\\uff09\u8fdb\u884c\u8f6c\u4e49\u3002\u4f8b\u5982\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f Python\u7684 pattern = r'\\.'<\/p>\n string = 'file.txt'<\/p>\n match = re.match(pattern, string)<\/p>\n if match:<\/p>\n print("Matched")<\/p>\n else:<\/p>\n print("Not matched")<\/p>\n <\/code><\/pre>\n<\/p>\n \u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c pattern = r'\\.'<\/p>\n string = 'file.txt'<\/p>\n match = re.search(pattern, string)<\/p>\n if match:<\/p>\n print("Matched")<\/p>\n else:<\/p>\n print("Not matched")<\/p>\n <\/code><\/pre>\n<\/p>\n \u5728\u6b64\u4f8b\u4e2d\uff0c pattern = r'\\.'<\/p>\n string = 'file.name.with.many.dots.txt'<\/p>\n matches = re.findall(pattern, string)<\/p>\n print(f"Number of dots: {len(matches)}")<\/p>\n <\/code><\/pre>\n<\/p>\n \u6b64\u4ee3\u7801\u5c06\u8f93\u51fa\u5b57\u7b26\u4e32\u4e2d\u70b9\u5b57\u7b26\u7684\u603b\u6570\u3002<\/p>\n<\/p>\n \u5728\u5904\u7406\u6587\u4ef6\u8def\u5f84\u65f6\uff0c\u5e38\u5e38\u9700\u8981\u63d0\u53d6\u6587\u4ef6\u7684\u6269\u5c55\u540d\u3002<\/p>\n<\/p>\n def get_extension(filename):<\/p>\n pattern = r'\\.([^.]+)$'<\/p>\n match = re.search(pattern, filename)<\/p>\n if match:<\/p>\n return match.group(1)<\/p>\n return None<\/p>\n filename = 'document.report.pdf'<\/p>\n extension = get_extension(filename)<\/p>\n print(f"File extension: {extension}")<\/p>\n <\/code><\/pre>\n<\/p>\n \u6b64\u51fd\u6570\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u6587\u4ef6\u540d\u4e2d\u6700\u540e\u4e00\u4e2a\u70b9\u4e4b\u540e\u7684\u5185\u5bb9\uff0c\u5373\u6587\u4ef6\u6269\u5c55\u540d\u3002<\/p>\n<\/p>\n \u9a8c\u8bc1\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u6709\u6548\u7684IP\u5730\u5740\u3002<\/p>\n<\/p>\n def is_valid_ip(ip):<\/p>\n pattern = r'^(\\d{1,3}\\.){3}\\d{1,3}$'<\/p>\n if re.match(pattern, ip):<\/p>\n return all(map(lambda x: 0 <= int(x) <= 255, ip.split('.')))<\/p>\n return False<\/p>\n ip = '192.168.1.1'<\/p>\n print(f"Is valid IP: {is_valid_ip(ip)}")<\/p>\n <\/code><\/pre>\n<\/p>\n \u6b64\u4ee3\u7801\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u9a8c\u8bc1IP\u5730\u5740\u683c\u5f0f\uff0c\u5e76\u786e\u4fdd\u6bcf\u4e2a\u6570\u5b57\u6bb5\u57280\u5230255\u4e4b\u95f4\u3002<\/p>\n<\/p>\n \u4eceURL\u4e2d\u63d0\u53d6\u57df\u540d\u3002<\/p>\n<\/p>\nre<\/code>\u6a21\u5757\u7528\u4e8e\u5904\u7406\u6b63\u5219\u8868\u8fbe\u5f0f\u3002\u4e3a\u4e86\u8be6\u7ec6\u8bf4\u660e\u5982\u4f55\u5728Python\u4e2d\u5339\u914d\u70b9\u5b57\u7b26\uff0c\u4e0b\u6587\u5c06\u4ecb\u7ecd\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u57fa\u7840\u77e5\u8bc6\u3001\u5982\u4f55\u4f7f\u7528re<\/code>\u6a21\u5757\u5339\u914d\u70b9\u5b57\u7b26\uff0c\u4ee5\u53ca\u5e94\u7528\u5b9e\u4f8b\u3002<\/p>\n<\/p>\n\u4e00\u3001\u6b63\u5219\u8868\u8fbe\u5f0f\u57fa\u7840<\/h3>\n<\/p>\n
re<\/code>\u6a21\u5757\u5b9e\u73b0\u3002\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u6709\u8bb8\u591a\u7279\u6b8a\u5b57\u7b26\uff0c\u70b9\uff08.\uff09\u5c31\u662f\u5176\u4e2d\u4e4b\u4e00\uff0c\u901a\u5e38\u7528\u6765\u5339\u914d\u9664\u6362\u884c\u7b26\u5916\u7684\u4efb\u4f55\u5355\u4e2a\u5b57\u7b26\u3002<\/p>\n<\/p>\n1\u3001\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u7279\u6b8a\u5b57\u7b26<\/h4>\n<\/p>\n
\n
2\u3001\u8f6c\u4e49\u5b57\u7b26<\/h4>\n<\/p>\n
\\\\.<\/code>\u7528\u4e8e\u5339\u914d\u4e00\u4e2a\u5b9e\u9645\u7684\u70b9\u5b57\u7b26\u3002<\/p>\n<\/p>\n\u4e8c\u3001\u4f7f\u7528re\u6a21\u5757\u5339\u914d\u70b9\u5b57\u7b26<\/h3>\n<\/p>\n
re<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u6765\u5904\u7406\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\uff0c\u5176\u4e2d\u6700\u5e38\u7528\u7684\u662fre.match()<\/code>\u3001re.search()<\/code>\u548cre.findall()<\/code>\u3002<\/p>\n<\/p>\n1\u3001re.match()<\/h4>\n<\/p>\n
re.match()<\/code>\u51fd\u6570\u5c1d\u8bd5\u4ece\u5b57\u7b26\u4e32\u7684\u8d77\u59cb\u4f4d\u7f6e\u5339\u914d\u4e00\u4e2a\u6a21\u5f0f\uff0c\u5982\u679c\u5339\u914d\u6210\u529f\uff0c\u5219\u8fd4\u56de\u4e00\u4e2a\u5339\u914d\u5bf9\u8c61\uff0c\u5426\u5219\u8fd4\u56deNone<\/code>\u3002<\/p>\n<\/p>\nimport re<\/p>\nre.match()<\/code>\u5c1d\u8bd5\u4ece\u5b57\u7b26\u4e32file.txt<\/code>\u7684\u8d77\u59cb\u4f4d\u7f6e\u5339\u914d\u70b9\u5b57\u7b26\uff0c\u4f46\u7531\u4e8e\u70b9\u4e0d\u662f\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\uff0c\u56e0\u6b64\u4e0d\u4f1a\u5339\u914d\u6210\u529f\u3002<\/p>\n<\/p>\n2\u3001re.search()<\/h4>\n<\/p>\n
re.search()<\/code>\u51fd\u6570\u626b\u63cf\u6574\u4e2a\u5b57\u7b26\u4e32\u5e76\u8fd4\u56de\u7b2c\u4e00\u4e2a\u6210\u529f\u5339\u914d\u7684\u5339\u914d\u5bf9\u8c61\u3002<\/p>\n<\/p>\nimport re<\/p>\nre.search()<\/code>\u4f1a\u626b\u63cf\u6574\u4e2a\u5b57\u7b26\u4e32file.txt<\/code>\u5e76\u5339\u914d\u5230\u7b2c\u4e00\u4e2a\u70b9\u5b57\u7b26\u3002<\/p>\n<\/p>\n3\u3001re.findall()<\/h4>\n<\/p>\n
re.findall()<\/code>\u51fd\u6570\u8fd4\u56de\u5b57\u7b26\u4e32\u4e2d\u6240\u6709\u4e0e\u6a21\u5f0f\u5339\u914d\u7684\u975e\u91cd\u53e0\u9879\u7684\u5217\u8868\u3002<\/p>\n<\/p>\nimport re<\/p>\n\u4e09\u3001\u5e94\u7528\u5b9e\u4f8b<\/h3>\n<\/p>\n
1\u3001\u6587\u4ef6\u6269\u5c55\u540d\u63d0\u53d6<\/h4>\n<\/p>\n
import re<\/p>\n2\u3001IP\u5730\u5740\u9a8c\u8bc1<\/h4>\n<\/p>\n
import re<\/p>\n3\u3001\u5339\u914d\u7f51\u5740\u4e2d\u7684\u57df\u540d<\/h4>\n<\/p>\n
import re<\/p>\n