diff --git a/.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata b/.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..919434a
--- /dev/null
+++ b/.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
diff --git a/Sources/Element.swift b/Sources/Element.swift
index fe7bde7..a5e10f0 100644
--- a/Sources/Element.swift
+++ b/Sources/Element.swift
@@ -1107,7 +1107,9 @@ open class Element: Node {
             if (classAttr.charAt(i).isWhitespace) {
                 if (inClass) {
                     // white space ends a class name, compare it with the requested one, ignore case
-                    if (i - start == wantLen && classAttr.regionMatches(true, start, className, 0, wantLen)) {
+                    if (i - start == wantLen && classAttr.regionMatches(ignoreCase: true, selfOffset: start,
+                                                                        other: className, otherOffset: 0,
+                                                                        targetLength: wantLen)) {
                         return true
                     }
                     inClass = false
@@ -1123,7 +1125,8 @@ open class Element: Node {
 
         // check the last entry
         if (inClass && len - start == wantLen) {
-            return classAttr.regionMatches(true, start, className, 0, wantLen)
+            return classAttr.regionMatches(ignoreCase: true, selfOffset: start,
+                                           other: className, otherOffset: 0, targetLength: wantLen)
         }
 
         return false
diff --git a/Sources/String.swift b/Sources/String.swift
index 645d330..723638f 100644
--- a/Sources/String.swift
+++ b/Sources/String.swift
@@ -120,14 +120,15 @@ extension String {
         return String.split(self, beginIndex, count)
     }
 
-    func regionMatches(_ ignoreCase: Bool, _ selfOffset: Int, _ other: String, _ otherOffset: Int, _ length: Int ) -> Bool {
+    func regionMatches(ignoreCase: Bool, selfOffset: Int,
+                       other: String, otherOffset: Int, targetLength: Int ) -> Bool {
         if ((otherOffset < 0) || (selfOffset < 0)
-            || (selfOffset > self.count - length)
-            || (otherOffset > other.count - length)) {
+            || (selfOffset > self.count - targetLength)
+            || (otherOffset > other.count - targetLength)) {
             return false
         }
 
-        for i in 0..<length {
+        for i in 0..<targetLength {
             let charSelf: Character = self[i+selfOffset]
             let charOther: Character = other[i+otherOffset]
             if(ignoreCase) {
diff --git a/Sources/TokenQueue.swift b/Sources/TokenQueue.swift
index 218ffc3..186affe 100644
--- a/Sources/TokenQueue.swift
+++ b/Sources/TokenQueue.swift
@@ -66,7 +66,8 @@ open class TokenQueue {
      * @return true if the next characters match.
      */
     open func matches(_ seq: String) -> Bool {
-        return queue.regionMatches(true, pos, seq, 0, seq.count)
+        return queue.regionMatches(ignoreCase: true, selfOffset: pos,
+                                   other: seq, otherOffset: 0, targetLength: seq.count)
     }
 
     /**