CODEWITHSUNDEEP
pythonregex
nanci
nanci

Reputation: 431

What's the best python regex for the special text?

hi，I have a log file，the file content is below：

[ 06-15 14:07:48.377 15012:15012 D/ViewRootImpl ]
ViewPostImeInputStage processKey 0

[ 06-15 14:07:48.397  3539: 4649 D/AudioService ]
active stream is 0x8

[ 06-15 14:07:48.407  4277: 4293 D/vol.VolumeDialogControl.VC ]
isSafeVolumeDialogShowing : false

I want to extract some information from the log file.The expected format is below:

[('06-15 14:07:48.377', '15012', 'D', 'ViewRootImpl', 'ViewPostImeInputStage processKey 0'),
('06-15 14:07:48.397', '3539', '4649', 'D', 'AudioService', 'active stream is 0x8'),
('06-15 14:07:48.407', '4277', '4293', 'D', 'vol.VolumeDialogControl.VC',  'isSafeVolumeDialogShowing : false')]

Question: What's the best python regex for extracting the expected format infomation? Thanks very much!

upate: I have tried the below code

import re
regex = r"(\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}.\d{3})\s(\d+).*(\w{1})/(.*)\](.*)"
data = [g.groups() for g in re.finditer(regex, log, re.M | re.I)]

The result I have got is 

data=[('06-15 14:07:48.377', '15012', 'D', 'ViewRootImpl', '\r'), (
'06-15 14:07:48.397', '3539', 'D', 'AudioService', '\r'), ('06-15 14:07:48.407', 
'4277', 'D', 'vol.VolumeDialogControl.VC', '\r')]

I can't get the last element.

Upvotes: 1

Views: 84

Answers (2)

ZiTAL
ZiTAL

Reputation: 3581

#!/usr/bin/python2
# -*- coding: utf-8 -*-

import re

input = """
[ 06-15 14:07:48.377 15012:15012 D/ViewRootImpl ]
ViewPostImeInputStage processKey 0

[ 06-15 14:07:48.397  3539: 4649 D/AudioService ]
active stream is 0x8

[ 06-15 14:07:48.407  4277: 4293 D/vol.VolumeDialogControl.VC ]
isSafeVolumeDialogShowing : false
"""

# remove carriage return
input = re.sub('(\])\s+', '\\1 ', input)

# replace D/Something ] -> D Something
input = re.sub('([A-Z]{1})/([^\s]+)\s+\]\s+', '\\1 \\2 ', input)

# remove first [
input = re.sub('\[\s+([0-9]{2}\-[0-9]{2})', '\\1', input)

print input

output 

06-15 14:07:48.377 15012:15012 D ViewRootImpl ViewPostImeInputStage processKey 0

06-15 14:07:48.397  3539: 4649 D AudioService active stream is 0x8

06-15 14:07:48.407  4277: 4293 D vol.VolumeDialogControl.VC isSafeVolumeDialogShowing : false

Upvotes: 1

RomanPerekhrest
RomanPerekhrest

Reputation: 92854

Use the following approach:

with open('yourlogfile', 'r') as log:
    lines = log.read()
    result = re.sub(r'^\[ (\S+) *(\S+) *(\d+): *(\d+) *([A-Z]+)\/(\S+) \]\n([^\n]+)\n?', 
                    r'\1 \2 \3 \4 \5 \6 \7', lines, flags=re.MULTILINE)

    print(result)

The output:

06-15 14:07:48.377 15012 15012 D ViewRootImpl ViewPostImeInputStage processKey 0
06-15 14:07:48.397 3539 4649 D AudioService active stream is 0x8
06-15 14:07:48.407 4277 4293 D vol.VolumeDialogControl.VC isSafeVolumeDialogShowing : false

To get the result as a list of matches use re.findall() function:

...
result = re.findall(r'^\[ (\S+) *(\S+) *(\d+): *(\d+) *([A-Z]+)\/(\S+) \]\n([^\n]+)\n?', lines, flags=re.MULTILINE)
print(result)

The output:

[('06-15', '14:07:48.377', '15012', '15012', 'D', 'ViewRootImpl', 'ViewPostImeInputStage processKey 0'), ('06-15', '14:07:48.397', '3539', '4649', 'D', 'AudioService', 'active stream is 0x8'), ('06-15', '14:07:48.407', '4277', '4293', 'D', 'vol.VolumeDialogControl.VC', 'isSafeVolumeDialogShowing : false')]

Upvotes: 2

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