How to find the offset of the first character in a string that's not a tab?

[Dick Kriesel]

> On Jan 21, 2021, at 2:25 AM, Dick Kriesel via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> Hi, Keith.  You could test each character until you find a tab:
> 
correction: until you find one that’s not a tab