Using regex in kibana filters

I am trying to validate a field against a regular expression (regex). but its not validating.

I have a filed like presentation number ( which is text field) and I would like to filter this filed only that starts with 0-9 or start with +449 and +4470 using regex (^[0-9]|^+44(9|70)) .

I tried enclosing my regex in / and " but didnt work.