Business rule - phone number

Hello Team

I wanted to create a business rule where my phone number cannot contain any alphacharacters.

I am trying to create this business rule , is there any way to mention the values at a time instead  of mentionin the multiple OR conditions.

For ex. For this logic I am mentionin like

If phone number contains A, or if Phone number contains B or .....

I am expecting some ting like if Phone number contains A, B, C

Can something similar  to this be achieved in Crm.Any help or guidance is highly appreciated.

Thanks