python: multiline regular expression

Question

I have a piece of text and I've got to parse usernames and hashes out of it. Right now I'm doing it with two regular expressions. Could I do it with just one multiline regular expression?

#!/usr/bin/env python

import re

test_str = """
Hello, UserName.
Please read this looooooooooooooooong text. hash
Now, write down this hash: fdaf9399jef9qw0j.
Then keep reading this loooooooooong text.

Hello, UserName2.
Please read this looooooooooooooooong text. hash
Now, write down this hash: gtwnhton340gjr2g.
Then keep reading this loooooooooong text.
"""

logins = re.findall('Hello, (?P<login>.+).',test_str)
hashes = re.findall('hash: (?P<hash>.+).',test_str)

score 5 · Accepted Answer · answered May 25 '10 at 09:16

5

Try this:

re.findall(r'Hello, (?P<login>[^.]+)\..+?hash: (?P<hash>[^.]+)', test_str, re.S)

answered May 25 '10 at 09:16

baloo

7,635
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or even: `re.findall(r'(?s)Hello, (?P[^.]+)\..+?hash: (?P[^.]+)', test_str)` (that is, include the flag inside the pattern) – tzot Jun 23 '10 at 09:41

score 2 · Answer 2 · answered May 25 '10 at 09:17

2

name_hash_pair = re.findall('Hello, ([^.]+).*?hash: ([^.]+)', test_str, re.DOTALL)
#gives [('UserName', 'fdaf9399jef9qw0j'), ('UserName2', 'gtwnhton340gjr2g')]

answered May 25 '10 at 09:17

Amarghosh

58,710
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PaulMcG · Answer 3 · 2010-05-25T21:43:36.663

A simple pyparsing version:

from pyparsing import *

username = Word(alphas,alphanums+"_")
hash = Word(alphanums)

patt = ("Hello," + username("username") + '.' + 
        SkipTo("write down this hash:", include=True) + 
        hash("hash"))

for tokens,start,end in patt.scanString(test_str):
    print tokens.hash, '->', tokens.username

# or to build a dict
hashNameLookup = dict((t.hash, t.username) 
                                for t,s,e in patt.scanString(test_str))

Prints:

fdaf9399jef9qw0j -> UserName
gtwnhton340gjr2g -> UserName2

python: multiline regular expression

3 Answers3

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