Expand email reg exp to allow only ; delimiter

I use the Regular Expression
([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)
resourced from  http://www.regexlib.com which works great.

I want to adapt  this to vlidate a sctring of emailaddress delinited by ;. So it would pass
 a@dummy.com
&
 a@dummy.com;b@dummy.com
 but not
a@dummy.com,b@dummy.com

So an optional [;] but how I can I ensure no other delimiters?

Thanks, Tom.
boardtcAsked:
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OrtokoboldCommented:
^(?:([\w\-\.]+@(?:(?:(?:\d{1,3}\.){3}\d{1,3})|(?:[\w\-]+\.[a-zA-Z]{2,4})))(?:$|\;))+

- The most important part is: (?:$|\;) . I just make sure that each e-mail address ends with EOL or ';' delimeter.
- \w is the word character: [a-zA-Z_0-9]
- \d is the digit character: [0-9]
- I use (?:X) as a non-capturing group. Remove all "?:" strings to get more readable (but also slower and more memory-consuming) version.
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boardtcAuthor Commented:
Thanks for the post. Unfortunately the regex falvour I use (TRegExpr for Delphi - http://regexpstudio.com/) gives the error : TRegExpr(comp): Unrecognized Modifer (pos 33) I'm not sure if it's the interval quantifier which it does not support.
I contacted the author a week ago but he has not replied...is there an alternative this might support?

Cheers, Tom.
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