Storing numeric index of alphabetic character in text string

How do I store the numeric index of the first alphabetic character in a text string? For example, TS1='%@3Gb6' returns Alpha1=4.

[Stephen23]

Here are two simple methods to get the indices of the alphabetic characters:

>> TS1 = '%@3Gb6';
>> regexp(TS1,'[A-Za-z]','once') % only the first
ans =  4
>> find(isstrprop(TS1,'alpha')) % all alphabetic
ans =
   4   5

What do you want to do with the indices?

Answer 1

[Jos (10584)]

ix = find(ismember(lower(TS1),'a':'z'),1,'first')