I am trying to validate an email field using Regex in Swift

Question

I am simply trying to validate an email using an expression. I have created a Struct that I use for my form fields.

 let emailRegEx = "[A-ZO-9a-z._%+-]+@[A-Za-zO-9.-J+|l.[A-Za-z]{2,64}"
    var isEmailValid: Bool {
        !email.isEmpty &&
        if email.ranges(of: emailRegEx, options: .regularExpression) == nil {
            return self
        }
    }

It keeps throwing this error...Cannot infer contextual base in reference to member 'regularExpression', and Expected expression after operator, lastly Extra argument 'options' in call.

Cannot use instance member 'email' within property initializer; property initializers run before 'self' is available...This was the response I just got. — Daniel Canup, Nov 05 '22 at 03:55
show us the complete code you are using, including how you declare `email` etc... — workingdog support Ukraine, Nov 05 '22 at 03:59

workingdog support Ukraine · Accepted Answer · 2022-11-05T04:18:09.067

0

Your if is in the wrong place, and .ranges should be .range.

Assuming your emailRegEx is correct, try this:

var isEmailValid: Bool = !email.isEmpty && (email.range(of: emailRegEx, options: .regularExpression) != nil)

Using a computed var, use this:

var isEmailValid: Bool {
    !email.isEmpty && (email.range(of: emailRegEx, options: .regularExpression) != nil)
}

You could also try this regex for email:

let emailRegEx = #"^\S+@\S+\.\S+$"#

Or

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

See also this SO post: How to validate an e-mail address in swift?

edited Nov 05 '22 at 04:18

answered Nov 05 '22 at 03:54

workingdog support Ukraine

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That was perfect minus one thing...it validates after just on character after the . could it be tweaked to include at least two? – Daniel Canup Nov 05 '22 at 04:03
You'll have to do a quick search on the net, for regex validating emails, there are plenty. I'm sure you will find something for your purpose. Updated my answer. – workingdog support Ukraine Nov 05 '22 at 04:09
I have been but it seems they are breaking things. The one you gave as a modification was awesome, however it is validating before the dot and then again after. – Daniel Canup Nov 05 '22 at 04:17
see my update, with the SO post: https://stackoverflow.com/questions/25471114/how-to-validate-an-e-mail-address-in-swift – workingdog support Ukraine Nov 05 '22 at 04:19
^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$ This is the golden egg! – Daniel Canup Nov 05 '22 at 04:22

I am trying to validate an email field using Regex in Swift

1 Answers1