Ruby find all elements between two symbols

gistfile1.rb

<% array_table = a.scan(/\((.*?)\ =>/) %>
<% array_index = a.scan(/\[(.*?)\]/) %>
<% com = "" %>
<% array_table.length.times do |element| %>
    <% if com != array_table[element].join(', ')%>
        <!-- Add commit -->
        # <%= array_table[element].join(', ') %></br>
    <% end %>
    <!-- Text construction for output -->
    add_index :<%= array_table[element].join(', ') %>, :<%= array_index[element].join(', ') %></br>
    <% com = array_table[element].join(', ') %>
<% end %>