Fix issue introduced by interaction between two recent PRs (#467)

The default value of parse_to was changed at the same time that
some new tests were added to the regex parser. The new tests did
not account for this, but no merge conflict existed.

operator/parser/regex/regex_test.go

@@ -112,6 +112,7 @@ func TestParserRegex(t *testing.T) {
 				Body: "a=b",
 			},
 			&entry.Entry{
+				Body: "a=b",
 				Attributes: map[string]interface{}{
 					"a": "b",
 				},
@@ -127,6 +128,7 @@ func TestParserRegex(t *testing.T) {
 				Body: "coredns-5644d7b6d9-mzngq_kube-system_coredns-901f7510281180a402936c92f5bc0f3557f5a21ccb5a4591c5bf98f3ddbffdd6.log",
 			},
 			&entry.Entry{
+				Body: "coredns-5644d7b6d9-mzngq_kube-system_coredns-901f7510281180a402936c92f5bc0f3557f5a21ccb5a4591c5bf98f3ddbffdd6.log",
 				Attributes: map[string]interface{}{
 					"container_id":   "901f7510281180a402936c92f5bc0f3557f5a21ccb5a4591c5bf98f3ddbffdd6",
 					"container_name": "coredns",