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regular expresssion email apostrophe

I need to do email verification in a PHP script that I have and I was using the below regular expression to verify that the email is valid.

^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$

but I recently ran into a valid user that has an apostrophe in is email like:

john.o'sullivan@domain.com

Can anyone help me modify the above expression or provide me with a better expression that will validate the above email?
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battalion
Asked:
battalion
1 Solution
 
ozoCommented:
fred&barney@stonehenge.com
is also a valid email address
unless you want a 6000 byte long regular expression to validate the  RFC-2822 mail header standard
you may be better off with something like
^.*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$
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smjunkCommented:
just add apostrophe to the list of characters  in the square brackets like this
^['_a-z0-9-]+(\.['_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$
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battalionAuthor Commented:
thanks this option works better for me
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