diff --git a/app/src/main/kotlin/com/simplemobiletools/contacts/extensions/String.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/extensions/String.kt
new file mode 100644
index 00000000..b76c81b7
--- /dev/null
+++ b/app/src/main/kotlin/com/simplemobiletools/contacts/extensions/String.kt
@@ -0,0 +1,6 @@
+package com.simplemobiletools.contacts.extensions
+
+import com.simplemobiletools.contacts.helpers.normalizeRegex
+import java.text.Normalizer
+
+fun String.normalizeString() = Normalizer.normalize(this, Normalizer.Form.NFD).replace(normalizeRegex, "")
diff --git a/app/src/main/kotlin/com/simplemobiletools/contacts/helpers/Constants.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/helpers/Constants.kt
index 0ee6468e..6e3c1608 100644
--- a/app/src/main/kotlin/com/simplemobiletools/contacts/helpers/Constants.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/contacts/helpers/Constants.kt
@@ -122,3 +122,5 @@ val localAccountTypes = arrayListOf("vnd.sec.contact.phone",
         "com.android.huawei.phone",
         "Local Phone Account"
 )
+
+val normalizeRegex = "\\p{InCombiningDiacriticalMarks}+".toRegex()
diff --git a/app/src/main/kotlin/com/simplemobiletools/contacts/models/Contact.kt b/app/src/main/kotlin/com/simplemobiletools/contacts/models/Contact.kt
index 3fbb72c5..06cd24d4 100644
--- a/app/src/main/kotlin/com/simplemobiletools/contacts/models/Contact.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/contacts/models/Contact.kt
@@ -4,8 +4,8 @@ import android.graphics.Bitmap
 import com.simplemobiletools.commons.helpers.SORT_BY_FIRST_NAME
 import com.simplemobiletools.commons.helpers.SORT_BY_MIDDLE_NAME
 import com.simplemobiletools.commons.helpers.SORT_DESCENDING
+import com.simplemobiletools.contacts.extensions.normalizeString
 import com.simplemobiletools.contacts.helpers.PHONE_NUMBER_PATTERN
-import java.text.Normalizer
 
 data class Contact(val id: Int, var prefix: String, var firstName: String, var middleName: String, var surname: String, var suffix: String, var photoUri: String,
                    var phoneNumbers: ArrayList<PhoneNumber>, var emails: ArrayList<Email>, var addresses: ArrayList<Address>, var events: ArrayList<Event>,
@@ -14,7 +14,6 @@ data class Contact(val id: Int, var prefix: String, var firstName: String, var m
     companion object {
         var sorting = 0
         var startWithSurname = false
-        val regex = "\\p{InCombiningDiacriticalMarks}+".toRegex()
     }
 
     override fun compareTo(other: Contact): Int {
@@ -23,25 +22,25 @@ data class Contact(val id: Int, var prefix: String, var firstName: String, var m
 
         when {
             sorting and SORT_BY_FIRST_NAME != 0 -> {
-                firstString = normalizeString(firstName)
-                secondString = normalizeString(other.firstName)
+                firstString = firstName.normalizeString()
+                secondString = other.firstName.normalizeString()
             }
             sorting and SORT_BY_MIDDLE_NAME != 0 -> {
-                firstString = normalizeString(middleName)
-                secondString = normalizeString(other.middleName)
+                firstString = middleName.normalizeString()
+                secondString = other.middleName.normalizeString()
             }
             else -> {
-                firstString = normalizeString(surname)
-                secondString = normalizeString(other.surname)
+                firstString = surname.normalizeString()
+                secondString = other.surname.normalizeString()
             }
         }
 
         if (firstString.isEmpty() && firstName.isEmpty() && middleName.isEmpty() && surname.isEmpty() && organization.company.isNotEmpty()) {
-            firstString = normalizeString(organization.company)
+            firstString = organization.company.normalizeString()
         }
 
         if (secondString.isEmpty() && other.firstName.isEmpty() && other.middleName.isEmpty() && other.surname.isEmpty() && other.organization.company.isNotEmpty()) {
-            secondString = normalizeString(other.organization.company)
+            secondString = other.organization.company.normalizeString()
         }
 
         var result = if (firstString.firstOrNull()?.isLetter() == true && secondString.firstOrNull()?.isLetter() == false) {
@@ -69,8 +68,6 @@ data class Contact(val id: Int, var prefix: String, var firstName: String, var m
         return result
     }
 
-    private fun normalizeString(string: String) = Normalizer.normalize(string, Normalizer.Form.NFD).replace(regex, "")
-
     fun getBubbleText() = when {
         sorting and SORT_BY_FIRST_NAME != 0 -> firstName
         sorting and SORT_BY_MIDDLE_NAME != 0 -> middleName