preg_match all words start with an @?

Question

i\'m not very firm with regular Expressions, so i have to ask you:

How to find out with PHP if a string contains a word starting with @ ??

e.g. i have a string l

Answer 1

Just incase this is helpful to someone in the future

/((?

This will match any word containing alphanumeric characters, starting with "@." It will not match words with "@" anywhere but the start of the word.

Matching cases:

@username
foo @username bar
foo @username1 bar @username2

Failing cases:

foo@username
@username$
@@username