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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 68,454 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,454 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.