[Ironruby-core] Code Review: Regex6

[Tomas Matousek]

tfpt review "/shelveset:Regex6;REDMOND\tomat"

Regexp fixes:

-       Implements Regexp.initialize
-       Fixes Regexp.new and compile signatures.
-       Regexp.new does no escaping, it just takes whatever string is given and makes up Regexp
-       Regexp.to_s returns "(?{enabled-options}-{disabled-options}:{pattern-with-forward-slash-escaped})"
-       Regexp.inspect returs "/{pattern-with-forward-slash-escaped}/"
-       Regexp.union does Regexp.escape (w/o calling it) on given strings (and objects converted using to_str   ) and does Regexp.to_s (w/o calling it) on given regexes, concatenates all results using | as separator and calls Regexp.new(<concatenated>, nil, nil) on the result.

Fixes escaping of strings (String#inspect).
Fixes chr, IO.write to honor current encoding.
Makes ConsoleStreams host-redirectable.

Tomas
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