[webview_flutter] : eliminated underscore in Javascript channel

packages/webview_flutter/CHANGELOG.md

@@ -1,6 +1,10 @@
 ## 0.3.13
 
 * Add an optional `userAgent` property to set a custom User Agent.
+
+## 0.3.13+1
+
+* Allow underscore in the JavaScript channel names.
 
 ## 0.3.12+1
 

packages/webview_flutter/lib/webview_flutter.dart

@@ -91,7 +91,7 @@ enum AutoMediaPlaybackPolicy {
   always_allow,
 }
 
-final RegExp _validChannelNames = RegExp('^[a-zA-Z_][a-zA-Z0-9]*\$');
+final RegExp _validChannelNames = RegExp('^[a-zA-Z_][a-zA-Z0-9_]*\$');
 
 /// A named channel for receiving messaged from JavaScript code running inside a web view.
 class JavascriptChannel {

packages/webview_flutter/test/webview_flutter_test.dart

@@ -454,6 +454,7 @@ void main() {
     final JavascriptMessageHandler noOp = (JavascriptMessage msg) {};
     JavascriptChannel(name: 'Tts1', onMessageReceived: noOp);
     JavascriptChannel(name: '_Alarm', onMessageReceived: noOp);
+    JavascriptChannel(name: 'foo_bar1_', onMessageReceived: noOp);
 
     VoidCallback createChannel(String name) {
       return () {