s/@/\/@/g;

[download]
But the real problem lies in how you declare $string, that is, the @ sign must be escaped if you use double quotes: 
$string = "foo\@bar.com";

# or better yet:
$string = 'foo@bar.com';

[download]
UPDATE:
_NOW_ i see the comment that says populated by DB query, sheesh!

Jeff 

R-R-R--R-R-R--R-R-R--R-R-R--R-R-R--
L-L--L-L--L-L--L-L--L-L--L-L--L-L--

In reply to (jeffa) Re: Search and replace for @ by jeffa
in thread Search and replace for @ by P0w3rK!d

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