HTML5 - validate input field using pattern attributes

Question

How can I validate a form field upon submission before sending a request to the server that the serial number has this exact format :

 <input type="text" id="serial" placeholder="123AB-BCXH3-778F2-90763">

(20 Characters, seperated by - for every 5 characters )

Thanks

Answer

Previous title was : Javascript check string format

My question was how to validate with Javascript but Joe below gave a good example using regex expressions, I have never used Regex but this what i learned today :

^\w{5}-\w{5}-\w{5}-\w{5}$ Where my Serial format is 5 Characters followed by "-"

\w => is any word Character a-z, A-Z, 0-9
{5} => Count 5 Characters
\- => backslash causes the metacharacter to be treated as a character, here "-"
$ => end of string
^ => Starting position

No need for JavaScript or jQuery, you can do this with HTML5 form validation in modern browsers :) — Benjamin Gruenbaum
– Benjamin Gruenbaum, Commented Mar 14, 2014 at 15:30
Sure, here's the first google result, basically you can specify a pattern attribute on input elements — Benjamin Gruenbaum
– Benjamin Gruenbaum, Commented Mar 14, 2014 at 15:31
When you do, please consider posting your solution as an answer so future visitors will know how to solve it. Good luck! — Benjamin Gruenbaum
– Benjamin Gruenbaum, Commented Mar 14, 2014 at 15:34

Joe Johnston · Accepted Answer · 2014-03-14 21:32:49Z

2

Here is a functional fiddle

<form>
    <input type="pid"  id="pid" maxlength="23" pattern="^\w{5}\-\w{5}\-\w{5}\-\w{5}$" required value="123AB-BCXH3-778F2-90763" size="35"/>

    <input type="submit" value="Submit" />
</form>

edited Mar 14, 2014 at 21:32

answered Mar 14, 2014 at 15:53

Joe Johnston

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2 Comments

Joe Johnston Over a year ago

The size property was just to be able to see the whole code.

Awena Over a year ago

Thanks Joe, very helpful approach. Answer added above.

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