Regular expressions help re.error: multiple repeat at position 23

[volcano63]

If they did not teach to name variables in English...

Variable names are part of function documentation, helping your reader to understand the code. Portuguese - you are discouraging your potential helpers from the international community.

Also, your code is too crowded, make it still less readable - see PEP-8 for guidance. And don't show the full code - show just places that don't work (again, helps your potential helpers to concentrate on your problem - and not on long strings most won't be able to read)

Still:

• Use this site to practice RE and RT(F)M for guidance. Try to figure out the common pattern - that is the purpose of RE, not endless if/elif/else chain
  
• re.match searches from the beginning of the string; ^ symbol is redundant.
  
• {1} is a redundant and stupid quantity modifier; it actually says "this string (sub-RE) will appear once"; if some string(sub-RE) shows within RE without quantity modifier - it means that you expect it to show once
  E.g, TCAGR{1} means that you expect string TCAG, followed by one R (actually, string comparison will do). You crowd your RE with meaningless modifiers, making them still harder to read
  

Couple of generic pointers:

• pedido[3]==1 or pedido[3]==2 or pedido[3]==4 or pedido[3]==5

  may be rewritten (take your pick)
  

  pedido[3] in [1, 2, 3, 4, 5]
  1 <= pedido[3] <= 5
  pedido[3] in range(1, 6)

• Most of your choice function are candidates for dict
  
• int(pedido[3]) == 1 or pedido[3] == '1'?
  
• Indents - well, you were already told