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)

Answer 1

Try this:

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

• tzot: or even: re.findall(r'(?s)Hello, (?P<login>[^.]+)\..+?hash: (?P<hash>[^.]+)', test_str) (that is, include the flag inside the pattern)

Answer 2

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

Answer 3

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