How do I find the index of a character in a string in Ruby?

Question

For example, str = 'abcdefg'. How do I find the index if c in this string using Ruby?

Answer 1

index(substring [, offset]) → fixnum or nil index(regexp [, offset]) → fixnum or nil 

Returns the index of the first occurrence of the given substring or pattern (regexp) in str. Returns nil if not found. If the second parameter is present, it specifies the position in the string to begin the search.

"hello".index('e')             #=> 1 "hello".index('lo')            #=> 3 "hello".index('a')             #=> nil "hello".index(?e)              #=> 1 "hello".index(/[aeiou]/, -3)   #=> 4 

Check out ruby documents for more information.

Answer 2

You can use this

"abcdefg".index('c')   #=> 2