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Python Regular Expressions in Python Introduction to Regular Expressions Email Groups

Elizabeth McInerney
Elizabeth McInerney
3,175 Points
Posted by Elizabeth McInerney
Elizabeth McInerney
3,175 Points

Twitter, 3 tries

I have tried to get twitter 3 different ways. Each is failing. Please show me why.

emails.py 
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'(?P<email>[\w+.]+@[\w.]+),\s(?P<phone>\d{3}-\d{3}-\d{4})',string)

twitters = re.search(r'\s@[\w\d]+)',string)
twitters = re.search(r'^\s@[\w\d]+)$',string, re.M)
twitters = re.search(r'^(?P<twitter>\s@[\w\d]+)$',string, re.M)

1 Answer

kacperwikiel
kacperwikiel
15,795 Points

twitters = re.search(r'(?P<twitter>)',string) #named group - catches nothing now twitters = re.search(r'(?P<twitter>@[\w])',string) #we will catch @ and word after that. twitters = re.search(r'(?P<twitter>@[\w]$)',string, re.MULTILINE) # $ - for end of line, and re.MULTILINE so each line will be parsed

Elizabeth McInerney
Elizabeth McInerney
3,175 Points
Elizabeth McInerney
Elizabeth McInerney
3,175 Points

Ok, this is what I do not get. Are you saying that you don't always use ^ and $ together? He used them together with re.M in the video. So if $ used together with re.M means look for something at the end of every line. What does ^$ used with re.M mean, or ^ used alone with re.M but without $?

Kenneth Love
Kenneth Love
Treehouse Guest Teacher
Kenneth Love
Kenneth Love
Treehouse Guest Teacher

^ beginning of string/line

$ end of string/line

You can use them together or independently. They're just to indicate position in the string/line.