diff --git a/SwiftValidator/Core/Validator.swift b/SwiftValidator/Core/Validator.swift
index f9b806c..aadac1c 100644
--- a/SwiftValidator/Core/Validator.swift
+++ b/SwiftValidator/Core/Validator.swift
@@ -55,11 +55,23 @@ public class Validator {
     }
     
     public func registerField(textField:UITextField, rules:[Rule]) {
-        validations[textField] = ValidationRule(textField: textField, rules: rules, errorLabel: nil)
+        registerFieldInternally(textField, errorLabel: nil, preparators: nil, rules: rules)
     }
     
     public func registerField(textField:UITextField, errorLabel:UILabel, rules:[Rule]) {
-        validations[textField] = ValidationRule(textField: textField, rules:rules, errorLabel:errorLabel)
+        registerFieldInternally(textField, errorLabel: errorLabel, preparators: nil, rules: rules)
+    }
+    
+    public func registerField(textField:UITextField, preparators: [Preparator], rules:[Rule]) {
+        registerFieldInternally(textField, errorLabel: nil, preparators: preparators, rules: rules)
+    }
+    
+    public func registerField(textField:UITextField, errorLabel:UILabel, preparators: [Preparator], rules:[Rule]) {
+        registerFieldInternally(textField, errorLabel: errorLabel, preparators: preparators, rules: rules)
+    }
+    
+    private func registerFieldInternally(textField: UITextField, errorLabel: UILabel?, preparators: [Preparator]?, rules: [Rule]) {
+        validations[textField] = ValidationRule(textField: textField, preparators: preparators, rules: rules, errorLabel: errorLabel)
     }
     
     public func unregisterField(textField:UITextField) {
diff --git a/SwiftValidator/Preparators/Preparator.swift b/SwiftValidator/Preparators/Preparator.swift
new file mode 100644
index 0000000..8c6feaa
--- /dev/null
+++ b/SwiftValidator/Preparators/Preparator.swift
@@ -0,0 +1,14 @@
+//
+//  Preparator.swift
+//  Validator
+//
+//  Created by Łukasz Osiennik on 30/10/15.
+//  Copyright (c) 2015 jpotts18. All rights reserved.
+//
+
+import Foundation
+
+public protocol Preparator {
+    
+    func prepare(textField: UITextField) -> Bool
+}
diff --git a/SwiftValidator/Preparators/TrimSpacesPreparator.swift b/SwiftValidator/Preparators/TrimSpacesPreparator.swift
new file mode 100644
index 0000000..da211f0
--- /dev/null
+++ b/SwiftValidator/Preparators/TrimSpacesPreparator.swift
@@ -0,0 +1,27 @@
+//
+//  TrimSpacesPreparator.swift
+//  Validator
+//
+//  Created by Łukasz Osiennik on 30/10/15.
+//  Copyright (c) 2015 jpotts18. All rights reserved.
+//
+
+import Foundation
+
+public class TrimSpacesPreparator: Preparator {
+    
+    public init() {
+        
+    }
+    
+    public func prepare(textField: UITextField) -> Bool {
+        
+        let previousText = textField.text ?? ""
+        
+        let currentText = previousText.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
+        
+        textField.text = currentText
+        
+        return currentText != previousText;
+    }
+}
diff --git a/SwiftValidator/Rules/ValidationRule.swift b/SwiftValidator/Rules/ValidationRule.swift
index c91d209..fcf0f4b 100644
--- a/SwiftValidator/Rules/ValidationRule.swift
+++ b/SwiftValidator/Rules/ValidationRule.swift
@@ -12,16 +12,26 @@ import UIKit
 public class ValidationRule {
     public var textField:UITextField
     public var errorLabel:UILabel?
+    public var preparators:[Preparator]?
     public var rules:[Rule] = []
     
-    public init(textField: UITextField, rules:[Rule], errorLabel:UILabel?){
+    public init(textField: UITextField, preparators: [Preparator]?, rules: [Rule], errorLabel: UILabel?) {
         self.textField = textField
         self.errorLabel = errorLabel
+        self.preparators = preparators
         self.rules = rules
     }
     
     public func validateField() -> ValidationError? {
+        
+        if let preparators = preparators {
+            
+            for preparator in preparators {
+                preparator.prepare(textField)
+            }
+        }
+        
         return rules.filter{ !$0.validate(self.textField.text ?? "") }
-                    .map{ rule -> ValidationError in return ValidationError(textField: self.textField, errorLabel:self.errorLabel, error: rule.errorMessage()) }.first
+            .map{ rule -> ValidationError in return ValidationError(textField: self.textField, errorLabel:self.errorLabel, error: rule.errorMessage()) }.first
     }
-}
\ No newline at end of file
+}
diff --git a/Validator.xcodeproj/project.pbxproj b/Validator.xcodeproj/project.pbxproj
index aadcb11..4a3c0e7 100644
--- a/Validator.xcodeproj/project.pbxproj
+++ b/Validator.xcodeproj/project.pbxproj
@@ -11,6 +11,8 @@
 		62D1AE221A1E6D4400E4DFF8 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 62D1AE201A1E6D4400E4DFF8 /* Main.storyboard */; };
 		62D1AE241A1E6D4400E4DFF8 /* Images.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 62D1AE231A1E6D4400E4DFF8 /* Images.xcassets */; };
 		62D1AE271A1E6D4400E4DFF8 /* LaunchScreen.xib in Resources */ = {isa = PBXBuildFile; fileRef = 62D1AE251A1E6D4400E4DFF8 /* LaunchScreen.xib */; };
+		D55702821BE375D6008D0ABB /* Preparator.swift in Sources */ = {isa = PBXBuildFile; fileRef = D55702811BE375D6008D0ABB /* Preparator.swift */; };
+		D55702841BE375F6008D0ABB /* TrimSpacesPreparator.swift in Sources */ = {isa = PBXBuildFile; fileRef = D55702831BE375F6008D0ABB /* TrimSpacesPreparator.swift */; };
 		FB465CB81B9884F400398388 /* SwiftValidator.h in Headers */ = {isa = PBXBuildFile; fileRef = FB465CB71B9884F400398388 /* SwiftValidator.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		FB465CBE1B9884F400398388 /* SwiftValidator.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = FB465CB31B9884F400398388 /* SwiftValidator.framework */; };
 		FB465CC71B9884F400398388 /* SwiftValidatorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = FB465CC61B9884F400398388 /* SwiftValidatorTests.swift */; };
@@ -89,6 +91,8 @@
 		62D1AE261A1E6D4400E4DFF8 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.xib; name = Base; path = Base.lproj/LaunchScreen.xib; sourceTree = "<group>"; };
 		62D1AE2C1A1E6D4500E4DFF8 /* ValidatorTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = ValidatorTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		62D1AE311A1E6D4500E4DFF8 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		D55702811BE375D6008D0ABB /* Preparator.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = Preparator.swift; path = Preparators/Preparator.swift; sourceTree = "<group>"; };
+		D55702831BE375F6008D0ABB /* TrimSpacesPreparator.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = TrimSpacesPreparator.swift; path = Preparators/TrimSpacesPreparator.swift; sourceTree = "<group>"; };
 		FB465CB31B9884F400398388 /* SwiftValidator.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = SwiftValidator.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		FB465CB61B9884F400398388 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		FB465CB71B9884F400398388 /* SwiftValidator.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SwiftValidator.h; sourceTree = "<group>"; };
@@ -205,9 +209,19 @@
 			name = "Supporting Files";
 			sourceTree = "<group>";
 		};
+		D55702801BE3759A008D0ABB /* Preparators */ = {
+			isa = PBXGroup;
+			children = (
+				D55702811BE375D6008D0ABB /* Preparator.swift */,
+				D55702831BE375F6008D0ABB /* TrimSpacesPreparator.swift */,
+			);
+			name = Preparators;
+			sourceTree = "<group>";
+		};
 		FB465CB41B9884F400398388 /* SwiftValidator */ = {
 			isa = PBXGroup;
 			children = (
+				D55702801BE3759A008D0ABB /* Preparators */,
 				FB465CE21B9889EA00398388 /* Rules */,
 				FB465CF01B9889EA00398388 /* Core */,
 				FB465CB71B9884F400398388 /* SwiftValidator.h */,
@@ -472,10 +486,12 @@
 				FB465CFE1B9889EA00398388 /* ValidationRule.swift in Sources */,
 				FB465CF31B9889EA00398388 /* ConfirmRule.swift in Sources */,
 				FB465D001B9889EA00398388 /* ValidationError.swift in Sources */,
+				D55702821BE375D6008D0ABB /* Preparator.swift in Sources */,
 				FB465CFC1B9889EA00398388 /* RequiredRule.swift in Sources */,
 				FB465CFB1B9889EA00398388 /* RegexRule.swift in Sources */,
 				FB465CF81B9889EA00398388 /* MinLengthRule.swift in Sources */,
 				FB465CF71B9889EA00398388 /* MaxLengthRule.swift in Sources */,
+				D55702841BE375F6008D0ABB /* TrimSpacesPreparator.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};