fix an autobug. Someone with a galaxy tab is trying to open the old

version of the URL.

Caused by java.net.MalformedURLException: Not a meshtastic URL
       at com.geeksville.mesh.model.Channel$Companion.urlToSettings(Channel.java:43)
       at com.geeksville.mesh.model.Channel$Companion.access$urlToSettings(Channel.java:19)
       at com.geeksville.mesh.model.Channel.<init>(Channel.java:50)
       at com.geeksville.mesh.MainActivity.perhapsChangeChannel(MainActivity.java:631)
       at com.geeksville.mesh.MainActivity.handleIntent(MainActivity.java:467)
       at com.geeksville.mesh.MainActivity.onNewIntent(MainActivity.java:447)
       at android.app.Activity.performNewIntent(Activity.java:7971)
       at android.app.Instrumentation.callActivityOnNewIntent(Instrumentation.java:1407)
       at android.app.Instrumentation.callActivityOnNewIntent(Instrumentation.java:1420)
       at android.app.ActivityThread.deliverNewIntents(ActivityThread.java:3838)
       at android.app.ActivityThread.handleNewIntent(ActivityThread.java:3850)
       at android.app.servertransaction.NewIntentItem.execute(NewIntentItem.java:53)
       at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
       at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2261)
       at android.os.Handler.dispatchMessage(Handler.java:107)
       at android.os.Looper.loop(Looper.java:237)
       at android.app.ActivityThread.main(ActivityThread.java:8107)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:496)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1100)

app/src/main/java/com/geeksville/mesh/model/Channel.kt

@@ -4,6 +4,7 @@ import android.graphics.Bitmap
 import android.net.Uri
 import android.util.Base64
 import com.geeksville.mesh.MeshProtos
+import com.geeksville.util.anonymize
 import com.google.zxing.BarcodeFormat
 import com.google.zxing.MultiFormatWriter
 import com.journeyapps.barcodescanner.BarcodeEncoder
@@ -32,15 +33,18 @@ data class Channel(
                 .setModemConfig(MeshProtos.ChannelSettings.ModemConfig.Bw125Cr45Sf128).build()
         )
 
-        const val prefix = "https://www.meshtastic.org/c/#"
+        private const val prefixRoot = "https://www.meshtastic.org/c/"
+        const val prefix = "$prefixRoot#"
 
         private const val base64Flags = Base64.URL_SAFE + Base64.NO_WRAP
 
         private fun urlToSettings(url: Uri): MeshProtos.ChannelSettings {
             val urlStr = url.toString()
-            val pathRegex = Regex("$prefix(.*)")
+
+            // Let the path optionally include the # character (or not) so we can work with old URLs generated by old versions of the app
+            val pathRegex = Regex("$prefixRoot#?(.*)")
             val (base64) = pathRegex.find(urlStr)?.destructured
-                ?: throw MalformedURLException("Not a meshtastic URL")
+                ?: throw MalformedURLException("Not a meshtastic URL: ${urlStr.anonymize(40)}")
             val bytes = Base64.decode(base64, base64Flags)
 
             return MeshProtos.ChannelSettings.parseFrom(bytes)