your right 2 patterns look easyer,

i am testing atm 5 million numbers and afterwards they will check with the system, then i know if all fit are some fail.

same testing atm for the regex fanboy pattern ;)

thx alot for the quick and very good help
kd ultibuzz

UPDATE:there is a problem with numbers like

215100069395
215100069395
215100153821
they shoud change into
215169395
215169395
2151153821

but they remained unchanged

UPDATE 2:i have it running with an if loop, if digit 2 or 3 is 0 use new pattern else my old one ^^
this isn't nice at all and i don't like it ;)