javascript - regular expression to validate one semicolon in front of an email -

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I just have to get an example of a semicolon in front of a single email address. As below: 

 ; Myemail@somedomain.com

regex should not match: 

 ; Myemail @ somedomain.com; Mysecondemail@somedomain.com

How do I cope with this method in regular expressions? Any help would be appreciated. 

  ^; Use regex like \ w + @ \ w +   
 
 
 <. .com $

See how regex works on


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