Parse a file - regex in python

Question

I want to export to a new txt file a list of URLs from another txt file. The first txt file looks like this :

http://pastebin.com/raw/10hvUbTi Emails: 631 Keywords: 0.0

http://pastebin.com/raw/5f0bnCq9 Emails: 61 Keywords: 0.0

I am trying to create a list that will look like this:

URL

URL

I am not get anything as an output in pycharm

Can someone help please?

import re
import urllib2
filename = 'C:\\file.txt'
pattern = ('^\S*')
with open(filename) as f:
    for line in f:
        if pattern in line:
            print line

Show us the example input and the expected output (real examples). — Krzysztof Krasoń
– Krzysztof Krasoń, Commented Jul 2, 2016 at 6:28
pastebin.com/raw/10hvUbTi Emails: 631 Keywords: 0.0 pastebin.com/raw/c42wEasR Emails: 283 Hashes: 142 . i got nothing in output, it doesnt — twitcolny
– twitcolny, Commented Jul 2, 2016 at 6:34
Please edit the question and add the examples there. We would need example of the input (few lines) and expected output. And also on which lines it fails. — Krzysztof Krasoń
– Krzysztof Krasoń, Commented Jul 2, 2016 at 6:34
it doesnt fail :/. i just get : "Process finished with exit code 0" — twitcolny
– twitcolny, Commented Jul 2, 2016 at 6:39
Did you post a link to a list of user accounts and their passwords here? — Klaus D.
– Klaus D., Commented Jul 2, 2016 at 7:46

Jan · Accepted Answer · 2016-07-02 08:19:45Z

1

You could go for:

import re

rx = re.compile(r'^(?P<email>[^|\n]+)', re.MULTILINE)
with open("emails.txt") as f:
    raw_data = f.read()
    emails = [match.group('email') for match in rx.finditer(raw_data)]
    print emails

Obviously, emails.txt needs to be adjusted here.
See a demo on regex101.com.

answered Jul 2, 2016 at 8:19

Jan

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Comments

Colin Yang · Accepted Answer · 2016-07-02 06:45:33Z

0

You did not use regular expression at all. You merely tested whether the raw string is in the line or not. To use regex,

pattern = re.compile(r'^\S*')

notice the r before pattern string there, it stands for raw string and is very important in regex.

To search for a pattern in a particular line, use

pattern.search(line)

It will return a MatchObject is a match is found, or None if nothing is found. More reference on python regular expression can be found in documentation.

answered Jul 2, 2016 at 6:45

Colin Yang

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1 Comment

cdarke Over a year ago

The pattern is meaningless unless captured. "zero or more non-whitespace" will match every line.

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