diff --git a/Pods/Pods.xcodeproj/xcuserdata/simon.xcuserdatad/xcschemes/Pods-TymateSwiftExtensions.xcscheme b/Pods/Pods.xcodeproj/xcuserdata/simon.xcuserdatad/xcschemes/Pods-TymateSwiftExtensions.xcscheme
index 89f1c7e..8b210a8 100644
--- a/Pods/Pods.xcodeproj/xcuserdata/simon.xcuserdatad/xcschemes/Pods-TymateSwiftExtensions.xcscheme
+++ b/Pods/Pods.xcodeproj/xcuserdata/simon.xcuserdatad/xcschemes/Pods-TymateSwiftExtensions.xcscheme
@@ -7,15 +7,15 @@
       buildImplicitDependencies = "YES">
       <BuildActionEntries>
          <BuildActionEntry
-            buildForAnalyzing = "YES"
             buildForTesting = "YES"
             buildForRunning = "YES"
             buildForProfiling = "YES"
-            buildForArchiving = "YES">
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
             <BuildableReference
                BuildableIdentifier = "primary"
                BlueprintIdentifier = "083A47769F9F3A87469ACEDFF36C1210"
-               BuildableName = "Pods-TymateSwiftExtensions.framework"
+               BuildableName = "Pods_TymateSwiftExtensions.framework"
                BlueprintName = "Pods-TymateSwiftExtensions"
                ReferencedContainer = "container:Pods.xcodeproj">
             </BuildableReference>
@@ -23,14 +23,17 @@
       </BuildActionEntries>
    </BuildAction>
    <TestAction
+      buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES"
-      buildConfiguration = "Debug">
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
       <AdditionalOptions>
       </AdditionalOptions>
    </TestAction>
    <LaunchAction
+      buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       launchStyle = "0"
@@ -38,17 +41,25 @@
       ignoresPersistentStateOnLaunch = "NO"
       debugDocumentVersioning = "YES"
       debugServiceExtension = "internal"
-      buildConfiguration = "Debug"
       allowLocationSimulation = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "083A47769F9F3A87469ACEDFF36C1210"
+            BuildableName = "Pods_TymateSwiftExtensions.framework"
+            BlueprintName = "Pods-TymateSwiftExtensions"
+            ReferencedContainer = "container:Pods.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
       <AdditionalOptions>
       </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
       savedToolIdentifier = ""
       useCustomWorkingDirectory = "NO"
-      debugDocumentVersioning = "YES"
-      buildConfiguration = "Release"
-      shouldUseLaunchSchemeArgsEnv = "YES">
+      debugDocumentVersioning = "YES">
    </ProfileAction>
    <AnalyzeAction
       buildConfiguration = "Debug">
diff --git a/Pods/Pods.xcodeproj/xcuserdata/simon.xcuserdatad/xcschemes/xcschememanagement.plist b/Pods/Pods.xcodeproj/xcuserdata/simon.xcuserdatad/xcschemes/xcschememanagement.plist
index 92e04ca..5f32022 100644
--- a/Pods/Pods.xcodeproj/xcuserdata/simon.xcuserdatad/xcschemes/xcschememanagement.plist
+++ b/Pods/Pods.xcodeproj/xcuserdata/simon.xcuserdatad/xcschemes/xcschememanagement.plist
@@ -8,11 +8,15 @@
 		<dict>
 			<key>isShown</key>
 			<false/>
+			<key>orderHint</key>
+			<integer>0</integer>
 		</dict>
 		<key>Pods-TymateSwiftExtensions.xcscheme</key>
 		<dict>
 			<key>isShown</key>
 			<false/>
+			<key>orderHint</key>
+			<integer>1</integer>
 		</dict>
 	</dict>
 	<key>SuppressBuildableAutocreation</key>
diff --git a/TymateSwiftExtensions.xcodeproj/project.pbxproj b/TymateSwiftExtensions.xcodeproj/project.pbxproj
index b5d6a00..f226037 100644
--- a/TymateSwiftExtensions.xcodeproj/project.pbxproj
+++ b/TymateSwiftExtensions.xcodeproj/project.pbxproj
@@ -9,6 +9,7 @@
 /* Begin PBXBuildFile section */
 		5B6AA39F467E0BF2D262468F /* Pods_TymateSwiftExtensions.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 6685F60706721708C67C8CF6 /* Pods_TymateSwiftExtensions.framework */; };
 		F464DAE522D39F2C002413BD /* TymateSwiftExtensions.h in Headers */ = {isa = PBXBuildFile; fileRef = F464DAE322D39F2C002413BD /* TymateSwiftExtensions.h */; settings = {ATTRIBUTES = (Public, ); }; };
+		F464DB1322D730A5002413BD /* StringExtensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = F464DB1222D730A5002413BD /* StringExtensions.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -18,6 +19,7 @@
 		F464DAE022D39F2C002413BD /* TymateSwiftExtensions.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = TymateSwiftExtensions.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		F464DAE322D39F2C002413BD /* TymateSwiftExtensions.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = TymateSwiftExtensions.h; sourceTree = "<group>"; };
 		F464DAE422D39F2C002413BD /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		F464DB1222D730A5002413BD /* StringExtensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StringExtensions.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -38,7 +40,6 @@
 				00955484756FD6B2C4E60979 /* Pods-TymateSwiftExtensions.debug.xcconfig */,
 				78A9AA7B809D409F49089628 /* Pods-TymateSwiftExtensions.release.xcconfig */,
 			);
-			name = Pods;
 			path = Pods;
 			sourceTree = "<group>";
 		};
@@ -73,6 +74,7 @@
 			children = (
 				F464DAE322D39F2C002413BD /* TymateSwiftExtensions.h */,
 				F464DAE422D39F2C002413BD /* Info.plist */,
+				F464DB1222D730A5002413BD /* StringExtensions.swift */,
 			);
 			path = TymateSwiftExtensions;
 			sourceTree = "<group>";
@@ -121,6 +123,7 @@
 				TargetAttributes = {
 					F464DADF22D39F2C002413BD = {
 						CreatedOnToolsVersion = 10.2;
+						LastSwiftMigration = 1020;
 					};
 				};
 			};
@@ -181,6 +184,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				F464DB1322D730A5002413BD /* StringExtensions.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -313,6 +317,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 00955484756FD6B2C4E60979 /* Pods-TymateSwiftExtensions.debug.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_IDENTITY = "";
 				CODE_SIGN_STYLE = Automatic;
 				DEFINES_MODULE = YES;
@@ -329,6 +334,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.tymate.TymateSwiftExtensions;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
@@ -338,6 +344,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 78A9AA7B809D409F49089628 /* Pods-TymateSwiftExtensions.release.xcconfig */;
 			buildSettings = {
+				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_IDENTITY = "";
 				CODE_SIGN_STYLE = Automatic;
 				DEFINES_MODULE = YES;
diff --git a/TymateSwiftExtensions.xcodeproj/xcuserdata/simon.xcuserdatad/xcschemes/xcschememanagement.plist b/TymateSwiftExtensions.xcodeproj/xcuserdata/simon.xcuserdatad/xcschemes/xcschememanagement.plist
index 06653f2..3be4640 100644
--- a/TymateSwiftExtensions.xcodeproj/xcuserdata/simon.xcuserdatad/xcschemes/xcschememanagement.plist
+++ b/TymateSwiftExtensions.xcodeproj/xcuserdata/simon.xcuserdatad/xcschemes/xcschememanagement.plist
@@ -7,7 +7,7 @@
 		<key>TymateSwiftExtensions.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>0</integer>
+			<integer>2</integer>
 		</dict>
 	</dict>
 </dict>
diff --git a/TymateSwiftExtensions.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/TymateSwiftExtensions.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/TymateSwiftExtensions.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/TymateSwiftExtensions.xcworkspace/xcuserdata/simon.xcuserdatad/UserInterfaceState.xcuserstate b/TymateSwiftExtensions.xcworkspace/xcuserdata/simon.xcuserdatad/UserInterfaceState.xcuserstate
new file mode 100644
index 0000000..fa31261
Binary files /dev/null and b/TymateSwiftExtensions.xcworkspace/xcuserdata/simon.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/TymateSwiftExtensions/StringExtensions.swift b/TymateSwiftExtensions/StringExtensions.swift
new file mode 100644
index 0000000..497cc83
--- /dev/null
+++ b/TymateSwiftExtensions/StringExtensions.swift
@@ -0,0 +1,19 @@
+//
+//  StringExtensions.swift
+//  TymateSwiftExtensions
+//
+//  Created by Simon on 11/07/2019.
+//  Copyright © 2019 Tymate. All rights reserved.
+//
+
+import Foundation
+
+public extension String {
+    func isValidEmail() -> Bool {
+        // print("validate calendar: \(testStr)")
+        let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
+
+        let emailTest = NSPredicate(format: "SELF MATCHES %@", emailRegEx)
+        return emailTest.evaluate(with: self)
+    }
+}