how to check if char in string?

Hello,
I want to check if I have a char in a file that the router is downloading

this is my file contents:

1325!4545!777!0000!444!8

and I want to check for “9” a - for me it’s an error
I have try this :

:global test [/file get Part1.txt contents ]
:put [:pick "9" $test]

but I get empty result , also if I check for 1\2\3…

what am I missing ?

Thanks ,