Subdreamer php problem

Hello all new member here needing some help .I have recently corrected a lot of deprecated errors related to ereg etc on my subdreamer site after searching and finding the answers i need via google, which all worked correctly except the code below which i now ask for help with , i previewed the code but cant work out the problem . for the line of code below i receive the error below . thanks for your time .

"warning: preg_match() [ href=‘function.preg-match’>function.preg-match]:
Compilation failed: unmatched parentheses at offset 71 "

[php] return (preg_match("/^([A-Za-z0-9]+_+)|([A-Za-z0-9]+-+)|([A-Za-z0-9]+.+)|([A-Za-z0-9]+++))*[A-Za-z0-9]+@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|(([a-zA-Z0-9-]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?)$/", $address));[/php]

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