Validating telephone

Hopefully these behaviours will converge in future releases.

For these examples we have created our own valid/invalid CSS formatting to override the browser default. That's why you may see something like the following: Before you type anything into the box a red marker is shown.

As mentioned above, we can improve on this by making use of the are already implicit so the input has to match the entire expression. If anyone wants to contribute a more thorough expression to test for valid email or url format, feel free to post it using the Feedback option above.. Since it is not possible to recurse when using a regular expression it is also not possible to create a truly accurate regex for doing email address validation.

The value, clicking 'down' with the input blank will result in a very large number. The examples posted in these responses are vastly oversimplified when compared against reality.

The simplest change you can make to your forms is to mark a text input field as 'required': This informs the (HTML5-aware) web browser that the field is to be considered mandatory.

Different browsers may mark the input box in some way (Firefox 4 Beta adds a red box-shadow by default), display a warning (Opera) or even prevent the form from being submitted if this field has no value.

Also each browser has a slightly different default behaviour.Hello Master Excel Gurus I imagine this question has been asked before, but when I looked through other posts I didn't see a formula that would work for me. I was still able to enter a phone number as text without an error message being produced. I need a data validation formula for cell O8 that would only allow data entry users to enter a phone number in the format ###-###-####. I am hoping a simple formula like =OR(ISNUMBER(o8), o8="-")) might work, but I am also open to using named ranges. Fortunately, we can assume that all browsers supporting HTML5 form validation techniques will also support images being replaced in the CSS by 'Base64 encoded datasets'. When you select a “tel” or “email” field on your mobile browser, it could open your address book for you to pick a phone number or address from.Using a service such as Spritebaker or other techniques, the above style settings become: The above code can now be copied directly to your CSS style sheet. :[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f] | \[\x01-\x09\x0b\x0c\x0e-\x7f])*") @ (? The fallback for the placeholder attribute in this article is far from accurate.

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In other web browsers they can be used in combination with the .

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