Custom app-id with regex for alphanumeric that limits to 10 characters

[chtoh82]

Am trying to create an app id that identifies a particular  pattern that only be 10 characters long and must be alphanumeric, had tried various syntax but seems not to be accepted as a correct pattern with the message that the expression is not at least 7 bytes. Anyone whom have such experiences can share the the correct expression syntax? Thanks!

The following is what I've tried:

[a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9]

.([a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9])

.([a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9])*

(.([a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9]))

[chtoh82]

I think i partially solved it by adding another anchor at the back,

blaabla[a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9]blaaa

Thank case, it needs to match exactly to 10 characters, however, not sure if  there is a way to make it into a range of from 1 to 10 characters..

[WPamungkas]

you can use "[\w]{1,10}" to match range from 1 to 10 alphanumeric characters