If you have backslashes in your string, you may need to escape them.
Something like this?
REM"\"123467
If yes, is it possible to have aregex to do that because the item list of my dropdown list is imported automatically
Thanks
No, that is not escaping, that is quoting. Are you using / or \ as they are different?
I use always \
REM\A-AA228339
Then try escaping it
REM\\A-AA228339