Oracle Regular query JSON returns the value of a field in a message

The interface return message is in JSON format, as follows:

{"Body": {"Businessinfo": {"c1rate": "25.00", "C2rate": "0.00", "C4rate": "0.00", "C5rate": "0.00", "C6rate": "6.00", " C8rate ":" 0.00 "," D1rate ":" 0.00 "," D2rate ":" 1.00 "," Riskcode ":" 0355 "," RuleId ":" R74000154606_11-0 "}," Vehicleinfo ": { "C1rate": "4.00", "C2rate": "0.00", "C4rate": "0.00", "C5rate": "0.00", "C6rate": "6.00", "C8rate": "0.00", "D1rate": "0.00 "," D2rate ":" 1.00 "," Riskcode ":" 0330 "," RuleId ":" R74000154617_11-0 "}}," Head ": {" error_code ":" 0000 "," error_message " : "Success", "Request_type": "???", "Response_code": "0"}}

Gets the value of the c1rate in the return message, using the Oracle regular query

Sql

Select I.c_app_no, i.c_req_content as Reuqest,
I.c_res_content as response,
Regexp_substr (c_res_content, ' \ "c1rate\": \ "([0-9.] +) \ "', 1, 1, ' I ') as C,
Regexp_substr (Regexp_substr (c_res_content, ' \ "c1rate\": \ "([0-9.] +) \ "', 1, 1, ' I '), ' ([0-9.] {2,}) ', and ' I ') as D
From Web_interface_soap_content I
WHERE c_app_no = ' 5997499035520170000382 ' and
C_interface_code = ' Feecontrlrequest '

Oracle Regular query JSON returns the value of a field in a message