I’m trying to figure out a clean way of restricting BJS input text entry to decimal numbers (chars 0 to 9, decimal point and negative sign). The following regex expression works nicely in my Flutter interface: RegExp(r"^-?\d*.?\d{0,3}"))
How can I add the regular expression ‘^-?\d*.?\d{0,3}’ to a BJS InputText box?
It would be great if the BJS InputText box had a regex ‘pattern’ attribute 
Hi! Like this: (only digits allowed in this example)
Thank you Roland. I don’t understand why it won’t work with my regex ^-?\d*.?\d{0,3} which should allow an optional minus, then digits, and optional decimal point and then digits to 3 decimal places. The regex works fine in Flutter and validates in online regex validators - any ideas why it doesn’t work here?
it’s not an optional decimal point. “.” is any (dot) character, so you need to escape it.
Forget regex and do this 
EDIT: And tailor to your needs. I don’t know a single person who can do regex properly all the time
not NaN 
Dude are you trolling or just being funny? 
not trolling, you can paste in stuff that doesn’t match the regex the OP is asking for. 3e1 is 30.
Thanks. Doesn’t permit leading decimal point and 3 decimal place limitation tho
I’ve tried loads of javascript stuff with regex and can’t get it to work…
A general regex solution would be useful to many people implementing text input, and a valuable addition to the documentation, IMHO.
/-?\d*\.?\d{0,3}/i.test('-1.3')
edit; you may want to group the decimal with the decimal places for a final verification as you want to allow it while typing - on key press can be restrictive for typing. typically a ‘blur’ event is easier for this kind of validation. agree validation would be helpful OOTB.
What about proposing a solution instead?
@rjt there is a clipboard observable, text changed observable. Look it up in the GUI docs / api. The first PG shows how to restrict text in a BabylonJS input. The second one offers an alternative. You can modify the condition to whatever you like. Sorry, I can’t help you with the regex itself, because I always search for it on the web when I need something. I am not experienced in this field.
Kudos dude!
EDIT: however it’s not working
I am getting curious why, can you please add it to the first PG and test it?
I would if I could get one to work…
Ok, give me a sec
If that is intended for me - I don’t think I would propose a solution as part of GUI. regex will only get you so far - If I was building an application that needed to restrict input then I would probably try to bring in a 3rd party form validation library and hook it into GUI events. Maybe somebody in the community has already done so and will share.
I meant to propose a regex solution. And you did it but I saw if after I posted my reply. However your regex doesn’t work for me.
Which numbers doesn’t it work for?
3.3333333 for example
/-?\d*.?\d{0,3}/i.test(‘-1a.3’) contains a letter and returns true
Dude I’ll get back to you and try to help after having my meal 