Regular expression problem

[Anon]

I'm trying to find words with starting symbol "@" using preg_match_all() function.
If the sting is "This @is a test", the output
should be "@is".
The regular expression I used is like this
"/\b@[a-zA-Z]+/". However, the output is not as desired.
What is the correct regular expression?

[Anon]

How about:
\b@[a-zA-Z]+\b

I've never used the \b character, but I think that should work.