Better way to return values from split - ruby

Question

I need to parse a field from a CSV column which is a string:
TXDAT - SnpRespData_SC or SnpRespData_SC_PD (7)
I need to extract:
type_0 = SnpRespData
resp_0 = SC
pd_0 = 0
type_1 = SnpRespData
resp_1 = SC
pd_1 = 1
from this string. I want to pass the whole string to a function and be able to return these six values.
The string could be any of the following:
a) TXDAT - SnpRespData_SC_PD
b) TXRSP - SnpResp_SC
c) TXDAT - SnpRespData_SC or SnpRespData_SC_PD (7)
d) TXRSP - SnpResp_UC or TXDAT - SnpRespData_UC_PD (7)
So I created a function which receives this string and returns the following:
def map_rxsnp_transaction(rxsnp_transaction)
tx_dat = []
tx_rsp = []
case rxsnp_transaction
when (/SnpRespData.*SnpRespData/)
tx_dat = rxsnp_transaction.split(/or/)
(tx_dat_0, dat_0_resp, dat_0_pd) = tx_dat[0].split(/_/)
(tx_dat_1, dat_1_resp, dat_1_pd) = tx_dat[1].split(/_/)
return [tx_dat_0, dat_0_resp, dat_0_pd, tx_dat_1, dat_1_resp, dat_1_pd]
when (/SnpResp.*SnpRespData/)
(tx_rsp, tx_dat) = rxsnp_transaction.split(/or/)
(tx_rsp, rsp_resp, rsp_pd) = tx_rsp.split(/_/)
(tx_dat, dat_resp, dat_pd) = tx_dat.split(/_/)
return [tx_rsp, rsp_resp, rsp_pd, tx_dat, dat_resp, dat_pd]
when (/SnpRespData_{1}/)
return rxsnp_transaction.split(//)
when (/SnpResp{1}/)
return rxsnp_transaction.split(/_/)
end
end
Function call:
(tx_rsp[0],tx_rsp[1],tx_rsp[2],tx_rsp[3],tx_rsp[4],tx_rsp[5]) = map_rxsnp_transaction table_col[5]
Just wondering if I can optimize this code better...don't like the way it

Answer 1

I assume that you are looking for a specific string, namely, "SnpRespData". If so, you could do this:
str = "TXDAT - SnpRespData_SC or SnpRespData_SC_PD (7)"
f, l = str.scan(/SnpRespData\w+/).sort
#=> ["SnpRespData_SC", "SnpRespData_SC_PD"]
type_0, resp_0, pd_0 = f.split('_') << 0
#=> ["SnpRespData", "SC", 0]
type_1, resp_1, pd_1 = f.split('_').first(2) << 1
#=> ["SnpRespData", "SC", 1]
type_0 #=> "SnpRespData"
resp_0 #=> "SC"
pd_0 #=> 0
type_1 #=> "SnpRespData"
resp_1 #=> "SC"
pd_1 #=> 1