⚡️ Replace the descriptor to allow flexible inputs

lib/src/command/add.dart

@@ -379,6 +379,13 @@ Specify multiple sdk packages with descriptors.''');
   /// Split [arg] on ':' and interpret it with the flags in [argResults] either
   /// as an old-style or a new-style descriptor to produce a PackageRef].
   _ParseResult _parsePackage(String arg, ArgResults argResults) {
+    // Removes the leading and the trailing quotes.
+    // https://github.com/dart-lang/pub/issues/4470
+    arg = arg.replaceAllMapped(
+      RegExp(r"""^['"](.*)['"]$"""),
+      (match) => match.group(1)!,
+    );
+
     var isDev = argResults.flag('dev');
     var isOverride = false;
 
@@ -415,7 +422,13 @@ Specify multiple sdk packages with descriptors.''');
     if (!packageNameRegExp.hasMatch(packageName)) {
       usageException('Not a valid package name: "$packageName"');
     }
-    final descriptor = match.namedGroup('descriptor');
+
+    // Explicitly adds a trailing space for commas and colons to help parsing
+    // a Yaml node. "key:value" will not be recognized as a valid entry.
+    final descriptor = match.namedGroup('descriptor')?.replaceAllMapped(
+          RegExp(r'([,:])(\S)'),
+          (match) => '${match.group(1)} ${match.group(2)}',
+        );
 
     if (isOverride && descriptor == null) {
       usageException('A dependency override needs an explicit descriptor.');