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Email validation in text input

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Posted on by jojos_iq

Hi there!

I am struggling with a basic email validation if statement and was wondering if someone could help. I have a text input in a power app that requires a user to put in an email address. The conditions required for the email address is either that it is matches the same format of a RegEx statement I have or the text box is blank. Below is the statement:

If(!IsMatch(personalEmaiInput.Text, "^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$") || !IsBlank(personalEmaiInput.Text), Set(varValidEmail, true), Set(varValidEmail, false))

This condition would control the Visible property of the error message. I want it to show the error message only if the email is invalid. This condition is on the OnChange property of the text input. When the conditions are met, it's meant to show an error text message and it should disappear when you enter a valid email address. The problem I am having is that it's showing the error message whether or not the email is valid.

The testing for this I have done is the following:

many variations of checking if the text input is blank which include
- checking if personalEmailInput.Text <> Blank()
- checking if personalEmailInput.Text <> ""
Instead of using "||", I tried using only one condition at a time and they work individually as expected
- the error message disappears when it meets the conditions

Any help or guidance would be appreciated! Please let me know if you need anymore information or screenshots etc.

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iAm_ManCat 18,201 Most Valuable Professional on at

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Re: Email validation in text input

😂

No worries, glad it was useful!
jojos_iq 90 on at

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Re: Email validation in text input

Just messing with you, it was actually a good value link - thanks for that, brother!
iAm_ManCat 18,201 Most Valuable Professional on at

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Re: Email validation in text input

Added that cos the IsMatch being used doesn't actually catch all valid emails 🤷
jojos_iq 90 on at

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Re: Email validation in text input

Weird plug but aight
iAm_ManCat 18,201 Most Valuable Professional on at

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Re: Email validation in text input

Hey I know this is already solved, just going to add here that I have a blog post that covers a regex formula that uses the RFC5322 standard to include all possible allowed characters under that convention

Email validation in Power Apps - iAm_ManCat Blog (iammancat.dev)
P_Anica 23 on at

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Re: Email validation in text input

Hi,
The following regular expression is a better:
IsMatch(tbEmail.Text, "^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$")
jojos_iq 90 on at

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Re: Email validation in text input

Your solution worked @v-xiaochen-msft - cheers mate!
swaminawale 195 on at

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Re: Email validation in text input

I did a modification in your code:

If(IsMatch(personalEmaiInput.Text, "^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$") && !IsBlank(personalEmaiInput.Text), Set(varValidEmail, true), Set(varValidEmail, false))

This should work now
Verified answer

v-xiaochen-msft on at

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Re: Email validation in text input

Hi @jojos_iq ,

Please try this

If(IsMatch(personalEmaiInput.Text, "^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$") || IsBlank(personalEmaiInput.Text), Set(varValidEmail, false), Set(varValidEmail, true))

Best Regards,

Wearsky
jojos_iq 90 on at

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Re: Email validation in text input

Hi @v-xiaochen-msft

This one would set the variable to true if it matches, but the variable is used to determine the Visible property of the error message. I don't want it to appear if it matches. I will adjust my problem now in the main post!

Thank you!