regex for Twitter username

by 
(?<=^|(?<=[^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:

  • @Hello
  • @you
  • @my_friend
  • @shahmirj

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

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