Question

我正在尝试解析一些日志文件，该文件的每一行都以时间戳开头，例如：

[11/16/18 16：40：04：097 EST]

如果日志中没有任何错误，则每一行将具有相同的起始模式。但是，如果发生某些错误，则将使用以下时间戳打印整个错误堆栈：

[11/16/18 16:40:04:100 EST] 000000ae CommerceSrvr  E MessagingViewCommandImpl nonHttpForwardDocument(String,String) CMN8014E: The URL constructed during composition using ViewName 
Additional Data: 
    null
Current exception:
Message:
_ERR_BSAFE_FUNCTION
Stack trace:

我想做的是额外增加整个错误堆栈，例如，输入是：

[11/16/18 16:40:04:098 EST] 000000ae CommandLogger 2   PerfLog <entry operation="Command : com.ibm.commerce.messaging.viewcommands.MessagingViewCommandImpl" parameters="@releaseID=9.0 
[11/16/18 16:40:04:100 EST] 000000ae CommerceSrvr  E MessagingViewCommandImpl nonHttpForwardDocument(String,String) CMN8014E: The URL constructed during composition using ViewName 
Additional Data: 
    null
Current exception:
Message:
_ERR_BSAFE_FUNCTION
Stack trace:
[11/16/18 16:40:04:101 EST] 000000ae SystemErr     R   
[11/16/18 16:40:04:102 EST] 000000ae SystemErr     R   com.ibm.commerce.exception.ECSystemException: The URL constructed during composition using ViewName http://localhost:80/webapp/wcs/stores/IBM.WC.Compose/webservices/OAGIS/9.0/BODs/AcknowledgePaymentInstruction.jsp/******** is invalid {1}.
    at com.ibm.commerce.messaging.viewcommands.MessagingViewCommandImpl.nonHttpForwardDocument(MessagingViewCommandImpl.java:581)

理想的输出应该是：

[11/16/18 16:40:04:100 EST] 000000ae CommerceSrvr  E MessagingViewCommandImpl nonHttpForwardDocument(String,String) CMN8014E: The URL constructed during composition using ViewName 
Additional Data: 
    null
Current exception:
Message:
_ERR_BSAFE_FUNCTION
Stack trace: 
[11/16/18 16:40:04:102 EST] 000000ae SystemErr     R   com.ibm.commerce.exception.ECSystemException: The URL constructed during composition using ViewName http://localhost:80/webapp/wcs/stores/IBM.WC.Compose/webservices/OAGIS/9.0/BODs/AcknowledgePaymentInstruction.jsp/******** is invalid {1}.
    at com.ibm.commerce.messaging.viewcommands.MessagingViewCommandImpl.nonHttpForwardDocument(MessagingViewCommandImpl.java:581)

尝试以下操作并失败，如果您可以让我知道我的代码有什么问题，那就太好了。

import re, sys

if len(sys.argv) > 1:
    with open(sys.argv[1]) as f:
        text = f.read()
else:
    text = sys.stdin.read()

p_start = r'^\[\d{2}/.*'
p_end = r'^\[\d{2}/.*'


pattern = r'{p0}(?!.*{p0})(?:.*?{p1}|.*)'.format(p0=p_start, p1=p_end)

error_no_match = 'No Match'

matches = re.findall(pattern, text, flags=re.M|re.DOTALL)

if matches:
    for match in matches:
        print 'match:', match
    print len(matches)
else:
    print error_no_match

Answer 1

当您将整个文件读入变量text时，可以使用

matches = re.findall(r'^\[\d{2}/.*(?:\n(?!\[\d{2}/).*)+', text, re.M)

请参见regex demo。请注意，如果您的文本包含CRLF结尾，则需要将\n替换为\r?\n（其中CR是可选的）。

详细信息

re.M修饰符使^在行首匹配
^-一行的开头
\[-一个[字符
\d{2}/-2位数字和一个/字符
.*-该行的其余部分
(?:\n(?!\[\d{2}/).*)+-重复一个或多个
- \n(?!\[\d{2}/)-一个LF符号（如果可以有CRLF结尾，请使用\r?\n），其后没有[和两位数字以及/
.*-该行的其余部分。

Python demo:

import re
rx = r"^\[\d{2}/.*(?:\n(?!\[\d{2}/).*)+"
text = "[11/16/18 16:40:04:098 EST] 000000ae CommandLogger 2   PerfLog <entry operation=\"Command : com.ibm.commerce.messaging.viewcommands.MessagingViewCommandImpl\" parameters=\"@releaseID=9.0 \n[11/16/18 16:40:04:100 EST] 000000ae CommerceSrvr  E MessagingViewCommandImpl nonHttpForwardDocument(String,String) CMN8014E: The URL constructed during composition using ViewName \nAdditional Data: \n    null\nCurrent exception:\nMessage:\n_ERR_BSAFE_FUNCTION\nStack trace:\n[11/16/18 16:40:04:101 EST] 000000ae SystemErr     R   \n[11/16/18 16:40:04:102 EST] 000000ae SystemErr     R   com.ibm.commerce.exception.ECSystemException: The URL constructed during composition using ViewName http://localhost:80/webapp/wcs/stores/IBM.WC.Compose/webservices/OAGIS/9.0/BODs/AcknowledgePaymentInstruction.jsp/******** is invalid {1}.\n    at com.ibm.commerce.messaging.viewcommands.MessagingViewCommandImpl.nonHttpForwardDocument(MessagingViewCommandImpl.java:581)"
matches = re.findall(rx, text, re.M)
print(matches)

输出：

[
  '[11/16/18 16:40:04:100 EST] 000000ae CommerceSrvr  E MessagingViewCommandImpl nonHttpForwardDocument(String,String) CMN8014E: The URL constructed during composition using ViewName \nAdditional Data: \n    null\nCurrent exception:\nMessage:\n_ERR_BSAFE_FUNCTION\nStack trace:', 
  '[11/16/18 16:40:04:102 EST] 000000ae SystemErr     R   com.ibm.commerce.exception.ECSystemException: The URL constructed during composition using ViewName http://localhost:80/webapp/wcs/stores/IBM.WC.Compose/webservices/OAGIS/9.0/BODs/AcknowledgePaymentInstruction.jsp/******** is invalid {1}.\n    at com.ibm.commerce.messaging.viewcommands.MessagingViewCommandImpl.nonHttpForwardDocument(MessagingViewCommandImpl.java:581)'
]

如何在两个模式之间找到输出线（它们是相同的）

1 个答案: