regex for Twitter username

If you're talking about the @username thing they use on twitter, then you can use this:

import re
twitter_username_re = re.compile(r'@([A-Za-z0-9_]+)')

To make every instance an HTML link, you could do something like this:

my_html_str = twitter_username_re.sub(lambda m: '<a href="http://twitter.com/%s">%s</a>' % (m.group(1), m.group(0)), my_tweet)

(?<=^|(?<=[^a-zA-Z0-9-_\.]))@([A-Za-z]+[A-Za-z0-9-_]+)

I've used this as it disregards emails.

Here is a sample tweet:

@Hello how are @you doing @my_friend, email @000 me @ [email protected] @shahmirj

Matches:

It will also work for hashtags, I use the same expression with the @ changed to #.

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