InfoPath Dev

^(\.[0-9]{1})$|^([0-1][0-9]?(\.[0-9]{1})?)$|^(24(\.0)?)$|^(2[0-3](\.[0-9]{1})?)$ i have this regular expression to validate user inputs in a textbox (any numbers from 0 to 24 with one decimal) but it doesn't seem to allow anything. i can break it down so it's easier to ...

I have a from that lets user to enter hours and quarter minutes, but I need to convert them into tenth of minutes and put the new number back to the textbox.  I am new to infopath but not sure how to use Rules to do that or if it's possible at all. Basically, if user enters 0.15, I convert the input to 0.3 or if user enters 12.44, ...