如何从python中的文本文件中提取以符号开头的某些字符串? [英] How to extract certain strings start with a symbol from a text file in python?

问题描述

如何从文本文件中提取所有从符号"$"开始的单词?

How can i extract all words start from symbol '$' from a text file?

提交一个(ascii)->

File a (ascii) -->

        @ExtendedAttr = nvp_add(@ExtendedAttr, "severity", $severity,  
 "description", $description, "eventID", $eventID,
             "eventURL", $eventURL, "alertLevel", $alertLevel, 
      "eventStart", $eventStart,
             "eventSourceCount", $eventSourceCount, "eventSourceTable", 
$eventSourceTable, "eventDestCount", $eventDestCount)

我希望输出像这样(都在新行中):

I want the output to be like this (all in new line) :

$severity
$description
$eventID
$eventURL
$alertLevel
$eventStart
$eventSourceCount
$eventSourceTable
$eventDestCount

推荐答案

使用regex:

>>> import re
>>> with open('filename') as f:
...     ans = []
...     for line in f:
...         matches = re.findall(r'(?<!\w)(\$\w+)', line)
...         ans.extend(matches)
...         
>>> print ans
['$severity', '$description', '$eventID', '$eventURL', '$alertLevel', '$eventStart', '$eventSourceCount', '$eventSourceTable', '$eventDestCount']

现在使用str.join获得预期的输出:

Now use str.join to get the expected output:

>>> print "\n".join(ans)
$severity
$description
$eventID
$eventURL
$alertLevel
$eventStart
$eventSourceCount
$eventSourceTable
$eventDestCount

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