Remove values which will not start with numbers

[bhaveshp90]

Hello, 

I have a field "Category" whose values are

1. ABC

2. DEF

3. GHI

000

ABCDEF

GHID 

How can I dynamically filter so that I want only fields which starts with "1. ABC", 2. DEF, ......"10. DEX" 

and remove fields that have only numbers and starts with unwanted texts (145365, ABCDEF, GHID)

thanks

[sunny_talwar · Accepted solution]

So, the pattern is that it will be a number before . and text after .? May be this

Where IsNum(Trim(SubField(Category, '.', 1))) and IsText(Trim(SubField(Category, '.', 2)))

[bhaveshp90]

thank you @sunny_talwar