diff --git a/Example/Example.xcodeproj/project.pbxproj b/Example/Example.xcodeproj/project.pbxproj
index 842ff12..2015048 100644
--- a/Example/Example.xcodeproj/project.pbxproj
+++ b/Example/Example.xcodeproj/project.pbxproj
@@ -8,8 +8,8 @@
 
 /* Begin PBXBuildFile section */
 		8F0F533B1DC1524A00791173 /* FormattedTextField.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8F0F53371DC1524A00791173 /* FormattedTextField.swift */; };
-		8F0F533D1DC1524A00791173 /* StringExtensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8F0F53391DC1524A00791173 /* StringExtensions.swift */; };
 		8F0F533E1DC1524A00791173 /* UITextFieldExtension.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8F0F533A1DC1524A00791173 /* UITextFieldExtension.swift */; };
+		8F93C22B1DC15913007A4101 /* StringExtension.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8F93C22A1DC15913007A4101 /* StringExtension.swift */; };
 		8FD40B571DC1366F0015DB1D /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8FD40B561DC1366F0015DB1D /* AppDelegate.swift */; };
 		8FD40B591DC1366F0015DB1D /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8FD40B581DC1366F0015DB1D /* ViewController.swift */; };
 		8FD40B5C1DC1366F0015DB1D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 8FD40B5A1DC1366F0015DB1D /* Main.storyboard */; };
@@ -19,8 +19,8 @@
 
 /* Begin PBXFileReference section */
 		8F0F53371DC1524A00791173 /* FormattedTextField.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FormattedTextField.swift; sourceTree = "<group>"; };
-		8F0F53391DC1524A00791173 /* StringExtensions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = StringExtensions.swift; sourceTree = "<group>"; };
 		8F0F533A1DC1524A00791173 /* UITextFieldExtension.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = UITextFieldExtension.swift; sourceTree = "<group>"; };
+		8F93C22A1DC15913007A4101 /* StringExtension.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = StringExtension.swift; sourceTree = "<group>"; };
 		8FD40B531DC1366F0015DB1D /* Example.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Example.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		8FD40B561DC1366F0015DB1D /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		8FD40B581DC1366F0015DB1D /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
@@ -44,8 +44,8 @@
 		8F0F53351DC1524A00791173 /* FormattedTextField */ = {
 			isa = PBXGroup;
 			children = (
+				8F93C22A1DC15913007A4101 /* StringExtension.swift */,
 				8F0F53371DC1524A00791173 /* FormattedTextField.swift */,
-				8F0F53391DC1524A00791173 /* StringExtensions.swift */,
 				8F0F533A1DC1524A00791173 /* UITextFieldExtension.swift */,
 			);
 			name = FormattedTextField;
@@ -155,8 +155,8 @@
 			buildActionMask = 2147483647;
 			files = (
 				8F0F533E1DC1524A00791173 /* UITextFieldExtension.swift in Sources */,
-				8F0F533D1DC1524A00791173 /* StringExtensions.swift in Sources */,
 				8F0F533B1DC1524A00791173 /* FormattedTextField.swift in Sources */,
+				8F93C22B1DC15913007A4101 /* StringExtension.swift in Sources */,
 				8FD40B591DC1366F0015DB1D /* ViewController.swift in Sources */,
 				8FD40B571DC1366F0015DB1D /* AppDelegate.swift in Sources */,
 			);
diff --git a/FormattedTextField.xcodeproj/project.pbxproj b/FormattedTextField.xcodeproj/project.pbxproj
index d3b3ae7..2df5888 100644
--- a/FormattedTextField.xcodeproj/project.pbxproj
+++ b/FormattedTextField.xcodeproj/project.pbxproj
@@ -10,7 +10,7 @@
 		8FD40B471DBEB3840015DB1D /* UITextFieldExtension.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8FD40B461DBEB3840015DB1D /* UITextFieldExtension.swift */; };
 		8FFF615C1DBC074E0033E1FC /* FormattedTextField.h in Headers */ = {isa = PBXBuildFile; fileRef = 8FFF615A1DBC074E0033E1FC /* FormattedTextField.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		8FFF61641DBC07C70033E1FC /* FormattedTextField.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8FFF61621DBC07C70033E1FC /* FormattedTextField.swift */; };
-		8FFF61651DBC07C70033E1FC /* StringExtensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8FFF61631DBC07C70033E1FC /* StringExtensions.swift */; };
+		8FFF61651DBC07C70033E1FC /* StringExtension.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8FFF61631DBC07C70033E1FC /* StringExtension.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -19,7 +19,7 @@
 		8FFF615A1DBC074E0033E1FC /* FormattedTextField.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = FormattedTextField.h; sourceTree = "<group>"; };
 		8FFF615B1DBC074E0033E1FC /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		8FFF61621DBC07C70033E1FC /* FormattedTextField.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FormattedTextField.swift; sourceTree = "<group>"; };
-		8FFF61631DBC07C70033E1FC /* StringExtensions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = StringExtensions.swift; sourceTree = "<group>"; };
+		8FFF61631DBC07C70033E1FC /* StringExtension.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = StringExtension.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -53,7 +53,7 @@
 			isa = PBXGroup;
 			children = (
 				8FFF61621DBC07C70033E1FC /* FormattedTextField.swift */,
-				8FFF61631DBC07C70033E1FC /* StringExtensions.swift */,
+				8FFF61631DBC07C70033E1FC /* StringExtension.swift */,
 				8FD40B461DBEB3840015DB1D /* UITextFieldExtension.swift */,
 				8FFF615A1DBC074E0033E1FC /* FormattedTextField.h */,
 				8FFF615B1DBC074E0033E1FC /* Info.plist */,
@@ -141,7 +141,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				8FFF61651DBC07C70033E1FC /* StringExtensions.swift in Sources */,
+				8FFF61651DBC07C70033E1FC /* StringExtension.swift in Sources */,
 				8FD40B471DBEB3840015DB1D /* UITextFieldExtension.swift in Sources */,
 				8FFF61641DBC07C70033E1FC /* FormattedTextField.swift in Sources */,
 			);
diff --git a/FormattedTextField/FormattedTextField.swift b/FormattedTextField/FormattedTextField.swift
index 0231537..ac7623d 100644
--- a/FormattedTextField/FormattedTextField.swift
+++ b/FormattedTextField/FormattedTextField.swift
@@ -51,7 +51,7 @@ open class FormattedTextField: UITextField {
     @IBInspectable open var textMask: String? {
         didSet(oldMask) {
             var cursorPosition: Int = 0
-            if let selectedRange = selectedCharachtersRange, let text = text {
+            if let selectedRange = selectedCharactersRange, let text = text {
                 cursorPosition = text.distance(from: text.startIndex, to: selectedRange.lowerBound)
             } else {
                 cursorPosition = 0
@@ -63,7 +63,7 @@ open class FormattedTextField: UITextField {
 
             if selectedTextRange != nil {
                 let cursorIndex = newFormattedText.index(newFormattedText.startIndex, offsetBy: cursorPosition, limitedBy: newFormattedText.endIndex) ?? newFormattedText.endIndex
-                selectedCharachtersRange = cursorIndex..<cursorIndex
+                selectedCharactersRange = cursorIndex..<cursorIndex
             }
         }
     }
@@ -210,7 +210,7 @@ open class FormattedTextField: UITextField {
 
         cursorPosition = min(cursorPosition, newFormattedText.characters.count)
         let cursorIndex = newFormattedText.index(newFormattedText.startIndex, offsetBy: cursorPosition)
-        selectedCharachtersRange = cursorIndex..<cursorIndex
+        selectedCharactersRange = cursorIndex..<cursorIndex
 
         sendActions(for: .editingChanged)
 
@@ -269,15 +269,15 @@ open class FormattedTextField: UITextField {
             return range
         }
 
-        let maskCharachtersRange = mask.range(fromNsRange: range)!
+        let maskCharactersRange = mask.range(fromNsRange: range)!
         var location = 0
-        for character in mask[mask.startIndex..<maskCharachtersRange.lowerBound].characters {
+        for character in mask[mask.startIndex..<maskCharactersRange.lowerBound].characters {
             if character == maskSymbol {
                 location += 1
             }
         }
         var length = 0
-        for character in mask[maskCharachtersRange].characters {
+        for character in mask[maskCharactersRange].characters {
             if character == maskSymbol {
                 length += 1
             }
@@ -289,18 +289,18 @@ open class FormattedTextField: UITextField {
         guard let mask = self.textMask else {
             return range
         }
-        let charachtersRange = mask.range(fromNsRange: range)!
-        if mask[charachtersRange].contains(String(maskSymbol)) {
+        let charactersRange = mask.range(fromNsRange: range)!
+        if mask[charactersRange].contains(String(maskSymbol)) {
             return range
         }
 
-        let searchRange = mask.startIndex..<charachtersRange.lowerBound
+        let searchRange = mask.startIndex..<charactersRange.lowerBound
 
         let deleteRange: Range<String.Index>
         if let removedSymbolRange = mask.range(of: String(maskSymbol), options: .backwards, range: searchRange, locale: nil) {
-            deleteRange = removedSymbolRange.lowerBound..<charachtersRange.upperBound
+            deleteRange = removedSymbolRange.lowerBound..<charactersRange.upperBound
         } else {
-            deleteRange = charachtersRange.upperBound..<charachtersRange.upperBound
+            deleteRange = charactersRange.upperBound..<charactersRange.upperBound
         }
 
         return mask.nsrange(fromRange: deleteRange)
diff --git a/FormattedTextField/StringExtensions.swift b/FormattedTextField/StringExtension.swift
similarity index 100%
rename from FormattedTextField/StringExtensions.swift
rename to FormattedTextField/StringExtension.swift
diff --git a/FormattedTextField/UITextFieldExtension.swift b/FormattedTextField/UITextFieldExtension.swift
index 7d22694..bc55ec9 100644
--- a/FormattedTextField/UITextFieldExtension.swift
+++ b/FormattedTextField/UITextFieldExtension.swift
@@ -9,7 +9,7 @@
 import UIKit
 
 extension UITextField {
-    var selectedCharachtersRange: Range<String.Index>? {
+    var selectedCharactersRange: Range<String.Index>? {
         get {
             guard let selectedTextRange = selectedTextRange else {
                 return nil