diff --git a/app/src/main/java/io/heckel/ntfy/ui/AddFragment.kt b/app/src/main/java/io/heckel/ntfy/ui/AddFragment.kt
index 834440d..36b7df8 100644
--- a/app/src/main/java/io/heckel/ntfy/ui/AddFragment.kt
+++ b/app/src/main/java/io/heckel/ntfy/ui/AddFragment.kt
@@ -92,12 +92,12 @@ class AddFragment(private val viewModel: SubscriptionsViewModel, private val onS
                     subscribeButton.isEnabled = false
                 } else if (useAnotherServerCheckbox.isChecked) {
                     subscribeButton.isEnabled = topic.isNotBlank()
-                            && "[-_A-Za-z0-9]+".toRegex().matches(topic)
+                            && "[-_A-Za-z0-9]{1,64}".toRegex().matches(topic)
                             && baseUrl.isNotBlank()
                             && "^https?://.+".toRegex().matches(baseUrl)
                 } else {
                     subscribeButton.isEnabled = topic.isNotBlank()
-                            && "[-_A-Za-z0-9]+".toRegex().matches(topic)
+                            && "[-_A-Za-z0-9]{1,64}".toRegex().matches(topic)
                 }
             }
         }
diff --git a/app/src/main/java/io/heckel/ntfy/ui/DetailActivity.kt b/app/src/main/java/io/heckel/ntfy/ui/DetailActivity.kt
index 9bf7b2f..efe9558 100644
--- a/app/src/main/java/io/heckel/ntfy/ui/DetailActivity.kt
+++ b/app/src/main/java/io/heckel/ntfy/ui/DetailActivity.kt
@@ -1,6 +1,10 @@
 package io.heckel.ntfy.ui
 
+import android.R.attr.label
 import android.app.AlertDialog
+import android.content.ClipData
+import android.content.ClipboardManager
+import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import android.text.Html
@@ -17,16 +21,12 @@ import androidx.core.content.ContextCompat
 import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.RecyclerView
 import com.android.volley.VolleyError
-import com.android.volley.toolbox.StringRequest
-import com.android.volley.toolbox.Volley
 import io.heckel.ntfy.R
 import io.heckel.ntfy.app.Application
 import io.heckel.ntfy.data.Notification
 import io.heckel.ntfy.data.topicShortUrl
-import io.heckel.ntfy.data.topicUrl
 import io.heckel.ntfy.msg.ApiService
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.launch
 import java.util.*
 
@@ -203,9 +203,21 @@ class DetailActivity : AppCompatActivity(), ActionMode.Callback {
     private fun onNotificationClick(notification: Notification) {
         if (actionMode != null) {
             handleActionModeClick(notification)
+        } else {
+            copyToClipboard(notification)
         }
     }
 
+    private fun copyToClipboard(notification: Notification) {
+        val message = notification.message + "\n\n" + Date(notification.timestamp * 1000).toString()
+        val clipboard: ClipboardManager = getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
+        val clip = ClipData.newPlainText("notification message", message)
+        clipboard.setPrimaryClip(clip)
+        Toast
+            .makeText(this, getString(R.string.detail_copied_to_clipboard_message), Toast.LENGTH_LONG)
+            .show()
+    }
+
     private fun onNotificationLongClick(notification: Notification) {
         if (actionMode == null) {
             beginActionMode(notification)
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 86285ef..6d5e71b 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -53,6 +53,7 @@
     <string name="detail_refresh_message_result">%1$d notification(s) added</string>
     <string name="detail_refresh_message_no_results">No new notifications found</string>
     <string name="detail_refresh_message_error">Could not refresh topic: %1$s</string>
+    <string name="detail_copied_to_clipboard_message">Copied to clipboard</string>
 
     <!-- Detail activity: Action bar -->
     <string name="detail_menu_test">Send test notification</string>