Count Function in User defined formula ?

Summary

Do we have Count Function in User defined formula ?

Content

Hi All, looking for quick info/help if someone knows if there is a way to write or use the count function in custom formulas in accounting hub?

example: if i want to count how many characters are there in a particular source field and then if thats = say count 10 then check if first 6 characters are numeric. as in 123456ADIG >  123456

Thanks

Gaurav