gistfile1.txt

a = %w(2 3 4 2 5 6 1 1 6 2 4 5) 
where = a.enum_with_index.map{ |v,i| i if v=="2"}.compact     #build an array of positions
p a[where[0]+1..where[1]-1]   #between 1. and 2. appearance
p a[where[1]+1..where[2]-1]   #suppose you wanted items between 2. and 3. appearance