diff --git a/AnimatedField/Classes/AnimatedField+TextFieldDelegate.swift b/AnimatedField/Classes/AnimatedField+TextFieldDelegate.swift
index 94c37ae..3281aba 100644
--- a/AnimatedField/Classes/AnimatedField+TextFieldDelegate.swift
+++ b/AnimatedField/Classes/AnimatedField+TextFieldDelegate.swift
@@ -19,17 +19,16 @@ extension AnimatedField: UITextFieldDelegate {
         
         // Copy new character
         var newInput = string
-        
-        // Replace special characters in newInput
-        newInput = newInput.replacingOccurrences(of: "`", with: "")
-        newInput = newInput.replacingOccurrences(of: "^", with: "")
-        newInput = newInput.replacingOccurrences(of: "¨", with: "")
-        
-        // Replace special characters in textField
-        textField.text = textField.text?.replacingOccurrences(of: "`", with: "")
-        textField.text = textField.text?.replacingOccurrences(of: "^", with: "")
-        textField.text = textField.text?.replacingOccurrences(of: "¨", with: "")
-        
+
+        let invalidCharacters = format.invalidCharacters.map { String($0) }
+        for invalidCharacter in invalidCharacters {
+            // Replace special characters in newInput
+            newInput = newInput.replacingOccurrences(of: invalidCharacter, with: "")
+
+            // Replace special characters in textField
+            textField.text = textField.text?.replacingOccurrences(of: invalidCharacter, with: "")
+        }
+
         // Apply uppercased & lowercased if available
         if uppercased { newInput = newInput.uppercased() }
         if lowercased { newInput = newInput.lowercased() }
diff --git a/AnimatedField/Classes/AnimatedField+TextViewDelegate.swift b/AnimatedField/Classes/AnimatedField+TextViewDelegate.swift
index 7214e89..c08a977 100644
--- a/AnimatedField/Classes/AnimatedField+TextViewDelegate.swift
+++ b/AnimatedField/Classes/AnimatedField+TextViewDelegate.swift
@@ -18,17 +18,16 @@ extension AnimatedField: UITextViewDelegate {
         
         // Copy new character
         var newInput = text
-        
-        // Replace special characters in newInput
-        newInput = newInput.replacingOccurrences(of: "`", with: "")
-        newInput = newInput.replacingOccurrences(of: "^", with: "")
-        newInput = newInput.replacingOccurrences(of: "¨", with: "")
-        
-        // Replace special characters in textView
-        textView.text = textView.text?.replacingOccurrences(of: "`", with: "")
-        textView.text = textView.text?.replacingOccurrences(of: "^", with: "")
-        textView.text = textView.text?.replacingOccurrences(of: "¨", with: "")
-        
+
+        let invalidCharacters = format.invalidCharacters.map { String($0) }
+        for invalidCharacter in invalidCharacters {
+            // Replace special characters in newInput
+            newInput = newInput.replacingOccurrences(of: invalidCharacter, with: "")
+
+            // Replace special characters in textView
+            textView.text = textView.text?.replacingOccurrences(of: invalidCharacter, with: "")
+        }
+
         // Apply uppercased & lowercased if available
         if uppercased { newInput = newInput.uppercased() }
         if lowercased { newInput = newInput.lowercased() }
diff --git a/AnimatedField/Classes/AnimatedFieldFormat.swift b/AnimatedField/Classes/AnimatedFieldFormat.swift
index b039713..7bf32bc 100644
--- a/AnimatedField/Classes/AnimatedFieldFormat.swift
+++ b/AnimatedField/Classes/AnimatedFieldFormat.swift
@@ -9,10 +9,13 @@
 import Foundation
 
 public struct AnimatedFieldFormat {
-    
+
+    /// String of characters to block/filter from input
+    public var invalidCharacters = "`^¨"
+
     /// Title always visible
     public var titleAlwaysVisible = false
-    
+
     /// Font for title label
     public var titleFont = UIFont.systemFont(ofSize: 13, weight: .regular)