Jquery Email regex validation

Question

I am using Jquery email Regex for validation as below:

@"^((([a-z]|\d|[!#\$%&'*+-/=\?\^_{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+))|((\x22)((((\x20|\x09)(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))(((\x20|\x09)(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))).)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))$"

Not sure why it does not allow for uppercase?! If email address should not contain any upper case or anything is wrong here.

That's an ugly regular expression, you should look at html5 and also jquery form validation plugin if you want better syntax. — nikhil
– nikhil, Commented Oct 4, 2012 at 10:46

Fabrizio Calderan · Accepted Answer · 2012-10-04 10:35:46Z

4

Everywhere you have an occurence of [a-z] character class, simply change it into [a-zA-Z]

(or specify the case insensitive flag/modifier i in your regexp)

answered Oct 4, 2012 at 10:35

Fabrizio Calderan

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5 Comments

skunkfrukt Over a year ago

Using the i flag is probably the least painful approach in this case.

Fabrizio Calderan Over a year ago

yep, indeed the flag is the simpler solution

patricgh Over a year ago

Thanks, but wondering why Jquery just validate lowercase for eamil addresses?

Fabrizio Calderan Over a year ago

there's no Jquery in what you posted. that is only a PCRE pattern, nothing more, nothing less :)

Elias Van Ootegem Over a year ago

@patricgh: what you posted is a string, too, not a RegExp object (yet), perhaps when the constructor is called i is passed as a second argument, to make the expression case-insensitive

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