Fix regex parsing (#799)

Fixes #792

Author: bguidolim

PhoneNumberKit/MetadataParsing.swift

@@ -49,7 +49,8 @@ public extension MetadataTerritory {
         let possibleNationalPrefixForParsing: String? = try container.decodeIfPresent(String.self, forKey: .nationalPrefixForParsing)
         let possibleNationalPrefix: String? = try container.decodeIfPresent(String.self, forKey: .nationalPrefix)
         nationalPrefix = possibleNationalPrefix
-        nationalPrefixForParsing = (possibleNationalPrefixForParsing == nil && possibleNationalPrefix != nil) ? nationalPrefix : possibleNationalPrefixForParsing
+        let nationalPrefixForParsing = (possibleNationalPrefixForParsing == nil && possibleNationalPrefix != nil) ? nationalPrefix : possibleNationalPrefixForParsing
+        self.nationalPrefixForParsing = nationalPrefixForParsing != nil ? nationalPrefixForParsing!.replacingOccurrences(of: "\\", with: #"\\"#) : nil
         nationalPrefixFormattingRule = try container.decodeIfPresent(String.self, forKey: .nationalPrefixFormattingRule)
         let availableFormats = try? container.nestedContainer(keyedBy: CodingKeys.self, forKey: .availableFormats)
         let temporaryFormatList: [MetadataPhoneNumberFormat] = availableFormats?.decodeArrayOrObject(forKey: .numberFormats) ?? [MetadataPhoneNumberFormat]()

PhoneNumberKitTests/PartialFormatterTests.swift

@@ -692,5 +692,11 @@ final class PartialFormatterTests: XCTestCase {
         _ = partialFormatter.formatPartial("+7")
         XCTAssertEqual(partialFormatter.currentRegion, "RU")
     }
+    
+    func testJerseyPhoneNumberWithoutPrefix() {
+        let partialFormatter = PartialFormatter(utility: utility, defaultRegion: "JE", withPrefix: false)
+        let testNumber = "078297"
+        XCTAssertEqual(partialFormatter.formatPartial(testNumber), "7829 7")
+    }
 }
 #endif