Re: Problem with latest macruby stable and unicode regexp

On 2011-03-27, at 13:05 , Glenn Gillen wrote:
> regexp `[\u{80}-\u{D7FF}\u{E000}-\u{FFFD}\u{10000}-\u{10FFFF}]' compilation error:
U_REGEX_BAD_ESCAPE_SEQUENCE (RegexpError)
> 
> Any ideas what I can do apart from forking Sass and opting for the 1.8 compatible regexp?

MacRuby ditched Oniguruma in favour of ICU regexps. They're mostly compatible but not 100%.

Here's the ICU equivalent for that pattern:

 /[\u0080-\uD7FF\uE000-\uFFFD\U00010000-\U0010FFFF]/

It uses the \uhhhh and \Uhhhhhhhh notation. It seems the \u{h…} notation is not supported. It also seems
that Oniguruma does not support the ICU style.

If you want to patch sass in a compatible way I'd look into just pre-expanding the escapes into actual
characters before building the regexp. This seems to work fine in both 1.9 and MacRuby:

 s = "\u{80}-\u{D7FF}\u{E000}-\u{FFFD}\u{10000}-\u{10FFFF}"
 r = /[#{s}]/

Notice I used double quotes for the string, so what you get is a string with actual unicode chars in it, not
escape sequences. The r regexp built using that string seems to work correctly in both rubies. At least it
evaluated without error.