email address regex rejects any upper case values

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Steve Wilkinson 132 posts 211 karma points

Apr 07, 2015 @ 09:54
0

Email address regex rejects any upper case values
```
^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$
```
the above rejects any upper case characters in the email address but mobile devices have a tendency to automatically start a new sentence with a capital and this then gets rejected.

I didn't think case mattered in emails so shouldn't it let any capitalisation through?

I tried changing this to
```
 ^[_A-Za-z0-9-]+(\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\.[A-Za-z0-9-]+)*(\.[A-Za-z]{2,4})$
```
but this didn't work either.

Is there anything I can do as we had two customers complain about the same problem?

Thanks
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Jan Skovgaard 11280 posts 23678 karma points MVP 11x admin c-trib

Apr 07, 2015 @ 10:09

1

Hi Steve

Yeah the capitalization in e-mail should not really matter - Where is the above Regex expressions from? Are they something that you are using on forms fields yourself? Or is it something from Contour/Forms?

I think you might be able to benefit from this service in order to test whether your regex is working or not https://regex101.com/

/Jan

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Steve Wilkinson 132 posts 211 karma points

Apr 07, 2015 @ 12:57

0

It's something from the Contour forms standard install - it's in templates/Contact form.ucf

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Steve Wilkinson 132 posts 211 karma points

Apr 07, 2015 @ 13:02

0

Saying that, just noticed that it seems to be a caching thing as the form has changed on the editing url but not the www url even though they point to the same files

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Chris Wilson 100 posts 377 karma points

Apr 09, 2015 @ 10:48
1
This is the regex I use, it should match all RFC 5322 compliant email addresses:
```
[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?
```
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