get value in variable position in string

I can have this strings:
RAPP C/C: 000009999 |
or
RAPP C/C: 000009999
or
RAPP C/C: 000009999

ecc...

i ned to intercept the string RAPP C/C: in whatever position and get always the right 6 digit from numeric string.

in this case i need to get 009999