In Zoho Inovices, I am trying to do a custom input format for a custom field.

I have tried a few variations, but this is my most recent: ^[a-z][A-Z][0-9][,][-][_][:][ ]$

In this field, I will be entering different alphanumeric information, depending on the circumstance.

It may be all or part of a vehicle's VIN number, or a dealer's stock number.

The field needs to accept:

1) Any letter, (upper or lower case)

2) any number

3) at least the following characters: (-) (,) (_) (:) - it is possible I could add others later

4) this could be in many lengths and combinations

The format above seems to work as long as I don't use any spaces.

A little help here would be much appreciated.

Thank you.