How to find the corresponding position in a string

How to find the corresponding string in a string set test_str = ['a';'b';'c'] test_str = 'a' 'b' 'c' How can i find out c and the output string is at position 3 of c

Answer 1

[Matt J]

test_str={'a','b','c'};

[exists,location]=ismember('c',test_str)

exists = logical
   1

location = 3

Answer 2

[Matt J]

test_str=['a','b','c']

test_str = 'abc'

location = strfind(test_str,'c')

location = 3