Regex for university emails

I am looking to validate email addresses by making sure they have a specific university subdomain, e.g. if the user says they attend Oxford University, I want to check tha开发者_C百科t their email ends in .ox.ac.uk

If I have the '.ox.ac.uk' part stored as a variable, how can I incorporate this with a regex to check the whole email is valid and ends in that variable suffix?

Many thanks!

We are using this email pattern (derived from this regular-expressions.info article):

^[\w!#$%&'*+/=?^`{|}~-]+(?:\.[\w!#$%&'*+/=?^`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?$`

You should be able to extend it with your needed suffix:

^[\w!#$%&'*+/=?^`{|}~-]+(?:\.[\w!#$%&'*+/=?`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+(?:\.ox\.ac\.uk)$`

Note that I replaced the TLD part [a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])? with your required suffix (?:\.ox\.ac\.uk) (\. is used to match the dot only)

Edit: one additional note: if you use String#matches(...) or Matcher#matches() there's no need for the leading ^ and the trailing $, since the entire string would have to match anyways.

Assuming you are using php.

$ending = '.ox.ac.uk';
if(preg_match('/'.preg_quote($ending).'$/i', $email_address)) //... your code

Further info: the preg_quote() is necessary so that characters get escaped if they have a special meaning. In your case it's the dots.

edit: To check if the whole email is valid, see other questions, it is asked a lot. Just wanted to help with your special case.