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Python Regular Expressions in Python Introduction to Regular Expressions Email Groups

Shawndee Boyd
Shawndee Boyd
5,917 Points

Make a new variable, twitters

I am confuse as to what I have wrong. Please help.

import re

string = '''Love, Kenneth, kenneth+challenge@teamtreehouse.com, 555-555-5555, @kennethlove
Chalkley, Andrew, andrew@teamtreehouse.co.uk, 555-555-5556, @chalkers
McFarland, Dave, dave.mcfarland@teamtreehouse.com, 555-555-5557, @davemcfarland
Kesten, Joy, joy@teamtreehouse.com, 555-555-5558, @joykesten'''

contacts = re.search(r'''
''', string, re.X|re.M)

twitters = (re.search(r'@[\w\d]+)$', contacts, re.M))

2 Answers

Chris Freeman
Chris Freeman
Treehouse Moderator 68,167 Points

When I run your code in ipython I get:

twitters = (re.search(r'@[\w\d]+)$', contacts, re.M))
error                                     Traceback (most recent call last)
<ipython-input-29-713b44e409ce> in <module>()
----> 1 twitters = (re.search(r'@[\w\d]+)$', contacts, re.M))

/usr/lib/python2.7/re.pyc in search(pattern, string, flags)
    140     """Scan through string looking for a match to the pattern, returning
    141     a match object, or None if no match was found."""
--> 142     return _compile(pattern, flags).search(string)
    144 def sub(pattern, repl, string, count=0, flags=0):

/usr/lib/python2.7/re.pyc in _compile(*key)
    242         p = sre_compile.compile(pattern, flags)
    243     except error, v:
--> 244         raise error, v # invalid expression
    245     if not bypass_cache:
    246         if len(_cache) >= _MAXCACHE:

error: unbalanced parenthesis

There are some missed placed parens In the line:

twitters = (re.search(r'@[\w\d]+)$', contacts, re.M))
  1. The parens wrapping the whole statement are unnecessary and should be removed.
  2. Add missing open paren to group the "twitter" group. Open "(" between r' and @. The close ")" appears to be in the correct place.

Try this:

twitters = re.search(r'(@[\w\d]+)$', string, re.M)
Shawndee Boyd
Shawndee Boyd
5,917 Points

Thank you, Chris! I was just thinking too fast.