With Javascript, how will I look for the first three letters in a string and see if they match "ABC"?

Question

With Javascript, how will I look for the first three letters in a string and see if they match "ABC"? Thanks

Answer 1

Using regex:

str.match(/^ABC/); 

or using the substring method:

 str.substring(0, 3) == 'ABC'; 

Answer 2

 if (/^ABC/.test(aString)) { } 

Answer 3

 "ABCDEF".match(/^ABC/)