diff --git a/app/src/main/kotlin/com/x8bit/bitwarden/ui/platform/feature/settings/autofill/blockautofill/util/StringExtensions.kt b/app/src/main/kotlin/com/x8bit/bitwarden/ui/platform/feature/settings/autofill/blockautofill/util/StringExtensions.kt
index 1cbbcf680c..98e16d0186 100644
--- a/app/src/main/kotlin/com/x8bit/bitwarden/ui/platform/feature/settings/autofill/blockautofill/util/StringExtensions.kt
+++ b/app/src/main/kotlin/com/x8bit/bitwarden/ui/platform/feature/settings/autofill/blockautofill/util/StringExtensions.kt
@@ -44,6 +44,6 @@ fun String.validateUri(existingUris: List<String>): Text? {
  * Checks if the string matches a specific URI pattern.
  */
 fun String.isValidPattern(): Boolean {
-    val pattern = "^(https?|androidapp)://([A-Za-z0-9-]+(?:\\.[A-Za-z0-9-]+)*)(/.*)?$".toRegex()
+    val pattern = "^(https?|androidapp)://([A-Za-z0-9_-]+(?:\\.[A-Za-z0-9_-]+)*)(/.*)?$".toRegex()
     return matches(pattern)
 }
diff --git a/app/src/test/kotlin/com/x8bit/bitwarden/ui/platform/feature/settings/autofill/blockautofill/util/StringExtensionsTest.kt b/app/src/test/kotlin/com/x8bit/bitwarden/ui/platform/feature/settings/autofill/blockautofill/util/StringExtensionsTest.kt
index 3d692dc5e9..b84eab6c93 100644
--- a/app/src/test/kotlin/com/x8bit/bitwarden/ui/platform/feature/settings/autofill/blockautofill/util/StringExtensionsTest.kt
+++ b/app/src/test/kotlin/com/x8bit/bitwarden/ui/platform/feature/settings/autofill/blockautofill/util/StringExtensionsTest.kt
@@ -54,7 +54,9 @@ class StringExtensionsTest {
             "https://a",
             "http://a.com",
             "https://subdomain.example.com",
+            "https://example.com/path_with_underscores",
             "androidapp://com.example.app",
+            "androidapp://com.example.app/path_with_underscores",
         )
 
         val invalidUris = listOf(