Remove some part from the text using regex in python3.x

Question

I need to remove the part until : from all the lines ( excluding : appearing in datetime format) given as below. Is there a way to pick the length and replace it with " ".

a.txt

Mon Sep 17 04:01:35 2018 abc.mnba:15885: afhoashfodcasnc.
Mon Sep 17 04:01:35 2018 abc.mnba:16199: inancaaldajijeijiodncna
Mon Sep 17 04:01:35 2018 abc:9: iunancn andjcadjjacnn noancoan
Mon Sep 17 04:01:35 2018 abc: abc = {
          'uf' => '',
          'uft' => 'afbcjbja',
          'ufd' => 'saflkacklmsakcmk',
          'ufc' => 'ubakcb'
        };

Expected Solution

afhoashfodcasnc.
inancaaldajijeijiodncna
iunancn andjcadjjacnn noancoan
$abc = {
          'uf' => '',
          'uft' => 'afbcjbja',
          'ufd' => 'saflkacklmsakcmk',
          'ufc' => 'ubakcb'
        };
askpfmkasmkvmksamvmk
Kdriver: jafnajncjjanjnnfjnjajjf 
fkcjkackkakkafjkajkfjdka
I hcjfdajnfcjnajncjjanjnjnjndjnfjcnjn
I afkjakcnakkdfjncnalldkfkdafkccnnlkn 

kdfjkackanjdnfjajsfdcjcnjnjanjnfcaksfaljscll
fajncjnjanjdnfjnajsdnfjcnjakncjajnfjajdfjanjncjnjnja
ijfiandfnanejfdcijiandnajfnejdfhncncjnjanjnedfncjanncfjanjcnj
akmfkcmkmakmkdmfekmfkmkckmakmdkmfkmkamdfcammdckmckcmkckdkal ladmflmalcml

My Solution

import re

with open("a.txt", 'r') as f:
    for lines in f:
        line = re.sub(r"^.{20}", "", lines)
        print(line)

John Nielsen · Accepted Answer · 2019-04-04 19:07:18Z

1

The pattern has to get a little more complicated than your suggestion. I have tested this one and it seems to get your expectedd result:

import re

with open("a.txt", 'r') as f:
    for lines in f:
        if ":" in lines:
            line = re.findall(r":\s?\D.+$", lines)[0][1:].strip()
        else:
            line = lines
        print(line)

This prints out the following result

afhoashfodcasnc.
inancaaldajijeijiodncna
iunancn andjcadjjacnn noancoan
$abc = {
          'uf' => '',
          'uft' => 'afbcjbja',
          'ufd' => 'saflkacklmsakcmk',
          'ufc' => 'ubakcb'
        };
askpfmkasmkvmksamvmk
Kdriver: jafnajncjjanjnnfjnjajjf 
fkcjkackkakkafjkajkfjdka
I hcjfdajnfcjnajncjjanjnjnjndjnfjcnjn
I afkjakcnakkdfjncnalldkfkdafkccnnlkn 

kdfjkackanjdnfjajsfdcjcnjnjanjnfcaksfaljscll
fajncjnjanjdnfjnajsdnfjcnjakncjajnfjajdfjanjncjnjnja
ijfiandfnanejfdcijiandnajfnejdfhncncjnjanjnedfncjanncfjanjcnj
akmfkcmkmakmkdmfekmfkmkckmakmdkmfkmkamdfcammdckmckcmkckdkal ladmflmalcml

edited Apr 4, 2019 at 19:07

answered Apr 1, 2019 at 18:31

John Nielsen

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4 Comments

user15051990 Over a year ago

Thanks John!. i know it requires some complicated regex pattern. But I am still naive to regex that's why it was challenge for me.

user15051990 Over a year ago

I am getting` IndexError: list index out of range` while running this code.

user15051990 Over a year ago

And only first three lines I am getting as a result.

John Nielsen Over a year ago

I made a small change in my original post. I have just tested it and it works. Try it out

sentence · Accepted Answer · 2019-04-01 18:05:30Z

1

What about this?

import re

with open("a.txt", 'r') as f:
    for lines in f:
        line = re.sub(r".*:", "", lines)
        print(line)

Note that it removes Kdriver: as well.

answered Apr 1, 2019 at 18:05

sentence

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