Is there a formula that will return positions of matches in an array?

[excelos]

Hello

Is there a formula that will return positions of matches in an array?
E.g. searching for "a" in {"a","b","a","c"} should return {1,0,3,0} or something like that?
I would then need to find the position that is e.g. ">2" and return that position to feed it into INDEX.

Thanks!

 

[JGordon11]

Book1
	A	B	C	D	E	F
1	a		1		3
2	b		0
3	a		3
4	c		0
5
Sheet2

Cell Formulas
Range	Formula
C1:C4	C1	=LET(a,A1:A4,(a="a")*(SEQUENCE(ROWS(a))))
E1	E1	=LET(a,A1:A4,pos,(a="a")*(SEQUENCE(ROWS(a))), MATCH(TRUE, pos>2,0))
Dynamic array formulas.