diff --git a/AKMaskField/AKMaskField.swift b/AKMaskField/AKMaskField.swift
index bb62819..119c436 100644
--- a/AKMaskField/AKMaskField.swift
+++ b/AKMaskField/AKMaskField.swift
@@ -158,10 +158,10 @@ open class AKMaskField: UITextField, UITextFieldDelegate  {
             var copy: Bool = true
             var _maskTemplate = String(maskTemplateDefault)
             
-            if maskTemplate.characters.count == maskExpression!.characters.count - (maskBlocks.count * 2) {
+            if maskTemplate.count == maskExpression!.count - (maskBlocks.count * 2) {
                 copy = false
                 _maskTemplate = maskTemplate
-            } else if maskTemplate.characters.count == 1 {
+            } else if maskTemplate.count == 1 {
                 _maskTemplate = maskTemplate
             }
             
@@ -217,7 +217,7 @@ open class AKMaskField: UITextField, UITextFieldDelegate  {
                 return
             }
             
-            _ = textField(self, shouldChangeCharactersIn: NSMakeRange(0, maskText.characters.count), replacementString: text ?? "")
+            _ = textField(self, shouldChangeCharactersIn: NSMakeRange(0, maskText.count), replacementString: text ?? "")
         }
     }
     
@@ -457,8 +457,8 @@ open class AKMaskField: UITextField, UITextFieldDelegate  {
         var location      = range.location
         var savedLocation = range.location
         
-        for replacementCharacter in string.characters {
-            if location == maskText?.characters.count { break }
+        for replacementCharacter in string {
+            if location == maskText?.count { break }
             
             // Find next character
             // If character outside the block, jump to first character of the next block
@@ -545,7 +545,7 @@ open class AKMaskField: UITextField, UITextFieldDelegate  {
                         // Start carret position
                         var _location = _range.location
                         
-                        for replacementCharacter in _string.characters {
+                        for replacementCharacter in _string {
                             if _location > maskBlocks[i].templateRange.length { break }
                             
                             if matchTextCharacter(replacementCharacter, withMaskCharacter: maskBlocks[i].chars[_location]) {
@@ -566,7 +566,7 @@ open class AKMaskField: UITextField, UITextFieldDelegate  {
 
                     if !_string.isEmpty {
                         
-                        var maskTextRange = NSMakeRange(_range.location, _string.characters.count)
+                        var maskTextRange = NSMakeRange(_range.location, _string.count)
                         
                         // Object
                         
diff --git a/AKMaskField/AKMaskFieldUtility.swift b/AKMaskField/AKMaskFieldUtility.swift
index 0970b25..7af8087 100644
--- a/AKMaskField/AKMaskFieldUtility.swift
+++ b/AKMaskField/AKMaskFieldUtility.swift
@@ -61,7 +61,7 @@ public class AKMaskFieldUtility {
     public class func matchesInString(_ string: String, pattern: String) -> [NSTextCheckingResult] {
         return  try!
             NSRegularExpression(pattern: pattern, options: .caseInsensitive)
-                .matches(in: string, options: NSRegularExpression.MatchingOptions(rawValue: 0), range: NSMakeRange(0, string.characters.count))
+                .matches(in: string, options: NSRegularExpression.MatchingOptions(rawValue: 0), range: NSMakeRange(0, string.count))
     }
     
     public class func findIntersection(_ ranges: [NSRange], withRange range: NSRange) -> [NSRange?] {