Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python Regular Expressions in Python Introduction to Regular Expressions Negation

Negation Regex video: Why does the [-\w ] portion of this query (at ~7:00) bring back two characters instead of one?

(Note: the teacher promptly adds a + at the end of this to correct it for the task at hand.)

2 Answers

Kenneth Love
STAFF
Kenneth Love
Treehouse Guest Teacher

That's a good question and it actually took me a minute to figure out. The [-\w ] didn't bring back two characters. It brought back one. But then the [^\t\n] brought back a second because the next character isn't a tab or newline.

Ah, that makes sense. Thanks, Kenneth!