FR: Support named capturing groups in RegExp

[DartBot]

This issue was originally filed by @stevenroose

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Many RegExp libraries in other programming languages support named capturing groups. Dart's doesn't.

More info: http://www.regular-expressions.info/named.html

[lrhn]

Dart is using the ECMAScript RegExp definition in order to be easily compiled to JavaScript.
Adding extra features would make it necessary to have an implementation of these features included in dart2js output and not just use the (highly optimized) native JS implementation of RegExp.

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Removed Type-Defect label.
Added Type-Enhancement, Library-Core, Area-Library, Triaged labels.

[DartBot]

This comment was originally written by @stevenroose

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That makes perfect sense.

Little sad that server-side Dart will always be constraint by Javascript.

[srawlins]

Big +1