I have an input-field that has a value(model) with microseconds(ex. 1950), and a filter that transforms the microseconds to a human readable format, for example 00:19.50(this is displayed in the input-field). How can i validate or force the user to keep this format?
You can chive this by making use of the pattern attribute which accepts a regular expression.
You can read more about it here: http://www.the-art-of-web.com/html/html5-form-validation/
This is the example they provide.
<input type="url" name="website" required pattern="https?://.+">
I hope this helps.
@gapvision privided you an answer with a correct patter that suit your needs