Here regex

[satyr]

• Introduce here regex (heregex?), a multiline/extended variant of regex literal.
• Stop interpolating normal regex literals for sane lexing. (See Slashes in character classes in RegExp literals #584.)

e.g.:

myurlp = ///
  ^ #{scheme} ://  # aka protocol
    #{host} /      # domain/IP
    #{ paths.join '/' }
    ( \?[^#\s]* )?  # optional query
///

would compile to:

myurlp = RegExp("^" + scheme + "://" + host + "/" + paths.join("/") + "(\\?[^#\\s]*)?")

[akidee]

Take a look at xregexp's x mode

[jashkenas]

I dig it, if you'd like to cook up a patch.

[satyr]

Cooked up:

• http://github.com/satyr/coffee-script/tree/heregex
  • http://github.com/satyr/coffee-script/compare/master...heregex

[jashkenas]

Heregexes are now merged in to master ... and interpolated regexes are gone. They're pretty fun. Closing the ticket.