diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/extensions/Strings.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/extensions/Strings.kt
index 9f979098f8..ec5a8bc644 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/extensions/Strings.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/extensions/Strings.kt
@@ -16,6 +16,11 @@
 
 package org.matrix.android.sdk.api.extensions
 
+import java.util.regex.Pattern
+
+const val emailPattern = "^[a-zA-Z0-9_!#\$%&'*+/=?`{|}~^-]+(?:\\.[a-zA-Z0-9_!#\$%&'*+/=?`{|}~^-]+)*@[a-zA-Z0-9-]+(?:\\.[a-zA-Z0-9-]+)*\$"
+val emailAddress: Pattern = Pattern.compile(emailPattern)
+
 fun CharSequence.ensurePrefix(prefix: CharSequence): CharSequence {
     return when {
         startsWith(prefix) -> this
@@ -23,6 +28,11 @@ fun CharSequence.ensurePrefix(prefix: CharSequence): CharSequence {
     }
 }
 
+/**
+ * Check if a CharSequence is an email.
+ */
+fun CharSequence.isEmail() = emailAddress.matcher(this).matches()
+
 /**
  * Append a new line and then the provided string.
  */
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/auth/login/DefaultLoginWizard.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/auth/login/DefaultLoginWizard.kt
index 0a8c58de16..86341729ca 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/auth/login/DefaultLoginWizard.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/auth/login/DefaultLoginWizard.kt
@@ -16,11 +16,11 @@
 
 package org.matrix.android.sdk.internal.auth.login
 
-import android.util.Patterns
 import org.matrix.android.sdk.api.auth.LoginType
 import org.matrix.android.sdk.api.auth.login.LoginProfileInfo
 import org.matrix.android.sdk.api.auth.login.LoginWizard
 import org.matrix.android.sdk.api.auth.registration.RegisterThreePid
+import org.matrix.android.sdk.api.extensions.isEmail
 import org.matrix.android.sdk.api.session.Session
 import org.matrix.android.sdk.api.util.JsonDict
 import org.matrix.android.sdk.internal.auth.AuthAPI
@@ -59,7 +59,7 @@ internal class DefaultLoginWizard(
             initialDeviceName: String,
             deviceId: String?
     ): Session {
-        val loginParams = if (Patterns.EMAIL_ADDRESS.matcher(login).matches()) {
+        val loginParams = if (login.isEmail()) {
             PasswordLoginParams.thirdPartyIdentifier(
                     medium = ThreePidMedium.EMAIL,
                     address = login,
diff --git a/vector/src/main/java/im/vector/app/core/extensions/BasicExtensions.kt b/vector/src/main/java/im/vector/app/core/extensions/BasicExtensions.kt
index 6bcbfe0ed5..692c85311a 100644
--- a/vector/src/main/java/im/vector/app/core/extensions/BasicExtensions.kt
+++ b/vector/src/main/java/im/vector/app/core/extensions/BasicExtensions.kt
@@ -21,6 +21,7 @@ import com.google.i18n.phonenumbers.NumberParseException
 import com.google.i18n.phonenumbers.PhoneNumberUtil
 import org.matrix.android.sdk.api.MatrixPatterns
 import org.matrix.android.sdk.api.extensions.ensurePrefix
+import org.matrix.android.sdk.api.extensions.isEmail
 
 fun Boolean.toOnOff() = if (this) "ON" else "OFF"
 
@@ -29,7 +30,7 @@ inline fun <T> T.ooi(block: (T) -> Unit): T = also(block)
 /**
  * Check if a CharSequence is an email.
  */
-fun CharSequence.isEmail() = Patterns.EMAIL_ADDRESS.matcher(this).matches()
+fun CharSequence.isEmail() = this.isEmail()
 
 fun CharSequence.isMatrixId() = MatrixPatterns.isUserId(this.toString())