Get substring from a string object


string = 'My first string'                   # => "My first string"

string[3, 5]                             # => "first"

1.	enter a string as the argument to []=, and it will return the new, corrected string, if found; nil otherwise.
2.	enter a range to indicate a range of characters you want to change. Include the last character with two dots (..)
3.	Getting the Parts of a String You Want
4.	String range with string.length
5.	Generating a Succession of Strings
6.	Change a string with range

Get substring from a string object : String Range « String « Ruby