What is the rex command to extract my field?

[nivethainspire_]

what is the rex command to extract the below highlighted field.
2015-12-22 22:40:13 ID="87602", Data_Name="sap01 "DDC - PVD - UDB SPP42 (LDTC1)"", Data_Type="DB2"

[richgalloway]

Try this search query

... | rex field=Data_Name "\s(?<field>[^\s]+)\s(?=\()" | ...