Fix pattern func for test

Author: phimage

Tests/XcodeProjKitWriteTests.swift

@@ -148,14 +148,16 @@ class XcodeProjKitWriteTests: XCTestCase {
 }
 
 fileprivate extension String {
-    func replacingOccurrences(matchingPattern pattern: String, replacementProvider: (String) -> String?) -> String {
-        let expression = try! NSRegularExpression(pattern: pattern, options: [])
-        let matches = expression.matches(in: self, options: [], range: NSRange(startIndex..<endIndex, in: self))
-        return matches.reversed().reduce(into: self) { (current, result) in
-            let range = Range(result.range, in: current)!
-            let token = String(current[range])
-            guard let replacement = replacementProvider(token) else { return }
-            current.replaceSubrange(range, with: replacement)
+    func replacingOccurrences(matchingPattern pattern: String, by replacement: String) -> String {
+        do {
+            let expression = try NSRegularExpression(pattern: pattern, options: [])
+            let matches = expression.matches(in: self, options: [], range: NSRange(startIndex..<endIndex, in: self))
+            return matches.reversed().reduce(into: self) { (current, result) in
+                let range = Range(result.range, in: current)!
+                current.replaceSubrange(range, with: replacement)
+            }
+        } catch {
+            return self
         }
     }
 }