String Range « String « Ruby

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.	Get substring from a string object
4.	Getting the Parts of a String You Want
5.	String range with string.length
6.	Generating a Succession of Strings
7.	Change a string with range