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Python Regular Expressions in Python Introduction to Regular Expressions Groups

Stephen Cole
PLUS
Stephen Cole
Courses Plus Student 11,670 Points

Can I cherry pick patterns within a string using Regular Expressions?

When using re, in the exercises (in Groups, for example), I have to use include a comma and a space between the two items I want. (Email and Phone.)

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.match(r'''
    (?P<email>[-\w\d.+]+@[-\w\d.]+)
    ,\s
    (?P<phone>\d{3}-\d{3}-\d{4})
''', string, re.M|re.X)

If I remove the comma and the space (,\s) the re won't work? Why not? The patterns, to themselves, seem to be unchanged.

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 67,736 Points

Keep in mind that the entire regex pattern must match the target string or nothing gets returned. While the groupings help formulate the results, the comma-space is needed to properly parse the input.

Without the comma-space, The pattern would not match unless there was an email address followed by a phone number with no comma space in between.