Initial data commit

Task/Substring/Ruby/substring.rb

@@ -0,0 +1,10 @@
+str = 'abcdefgh'
+n = 2
+m = 3
+puts str[n, m]                  #=> cde
+puts str[n..m]                  #=> cd
+puts str[n..-1]                 #=> cdefgh
+puts str[0..-2]                 #=> abcdefg
+puts str[str.index('d'), m]     #=> def
+puts str[str.index('de'), m]    #=> def
+puts str[/a.*d/]                #=> abcd