RegExpValidator { regExp: /[\w ]+/ } scrambles iPad keyboard

1) Switch iPad keyboard to [.?123] mode

2) Type any valid characters in a TextField with this validator:

validator: RegExpValidator { regExp: /[\w ]+/ }

Result:

Typing - (dash) acts a backspace
Typing ' (apostrophe) toggles keyboard back to [ABC] mode

I think behavior intended or not?