Don't use regular expressions in Loader.

pubspec.yaml

Index: pubspec.yaml
diff --git a/pubspec.yaml b/pubspec.yaml
index 618f82befff8cad14021ade3dbc0a55d073596b7..ad2e7ca2f8e6d1f61ff126a15aed6bdad7c6b3e3 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,15 +1,14 @@
 name: yaml
-version: 2.1.4-dev
+version: 2.1.4
 author: "Dart Team <misc@dartlang.org>"
 homepage: https://github.com/dart-lang/yaml
 description: A parser for YAML.
 dependencies:
-  charcode: "^1.1.0"
   collection: ">=1.1.0 <2.0.0"
   path: ">=1.2.0 <2.0.0"
-  string_scanner: "^0.1.4"
+  string_scanner: ">=0.1.3 <0.2.0"
   source_span: ">=1.0.0 <2.0.0"
 dev_dependencies:
   test: ">=0.12.0 <0.13.0"
 environment:
-  sdk: '>=1.8.0 <2.0.0'
+  sdk: '>=1.12.0 <2.0.0'

[Bob Nystrom, 2015/09/02 23:13:14]

I worry this is too restrictive for consumers of the package. Maybe hold off on
null-aware operators until 1.13 and more people have had time to upgrade to
1.12?

[nweiz, 2015/09/02 23:37:59]

I agree when making API changes, but we aren't doing that here, nor do we plan
to in the near future. This isn't likely to cause version lock, and I don't feel
bad about telling users to use the latest SDK for the best performance.