Fixed dart web stack trace filtering, fixes #102

Author: Bungeefan

lib/src/printers/pretty_printer.dart

@@ -55,15 +55,15 @@ class PrettyPrinter extends LogPrinter {
   ///
   /// For example:
   /// * packages/logger/src/printers/pretty_printer.dart 91:37
-  static final _webStackTraceRegex = RegExp(r'^((packages|dart-sdk)/\S+/)');
+  static final _webStackTraceRegex = RegExp(r'^((?:packages|dart-sdk)/\S+/)');
 
   /// Matches a stacktrace line as generated by browser Dart.
   ///
   /// For example:
   /// * dart:sdk_internal
   /// * package:logger/src/logger.dart
   static final _browserStackTraceRegex =
-      RegExp(r'^(?:package:)?(dart:\S+|\S+)');
+      RegExp(r'^((?:package:)?dart:\S+|\S+)');
 
   static DateTime? startTime;