Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Regular Expressions in Python Introduction to Regular Expressions Negation

Sahar Nasiri
Sahar Nasiri
7,454 Points
Posted by Sahar Nasiri
Sahar Nasiri
7,454 Points

Why do I have an error?

print(re.findall(r'''
    \b+@[-\w\d.]* #First a word boundary, an @, and then any number of characters
    [^gov\t]+     #ignor 1+instances of the letters 'g', 'o' or 'v' and a tab.
    \b            #Match another word boundary
''', data, re.VERBOSE|re.I))

[MOD: added ```python markdown formatting -cf]

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,423 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

The + means "one or more". The word boundary character \b is a "zero-length" character as it matches a position but no specific character therefore you can not have "one or more" boundary characters. The specific error is "nothing to repeat"

Change "\b+" to "\b" should fix your error.