Update integer regex

[cferdinandi]

^[\d]*$

[FloEdelmann]

Actually, this will not work: https://stackoverflow.com/questions/18852244/how-to-get-the-raw-value-an-input-type-number-field

If the browser natively supports the <input type="number" /> element, its value property will be set to an empty string until a valid number is entered. So it is impossible to catch this case.

A workaround could be to listen to the browser's own validityState and use it as a fallback.

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Apart from that, the RegEx should actually be /^[-+]?(?:\d+|\d*[.,]\d+)$/

[cferdinandi]

This is a fallback for browsers that do not support number.