[Rd] Support for Dashes in the Raw String Delimiter

[Juan Telleria Ruiz de Aguirre]

Dear R Developers,

As regards "Support for Dashes in the Raw String Delimiter" from commit:

https://github.com/wch/r-source/commit/4d4781ad19890193d5eb458d71f18d7e53ee73c5

Would it be possible to support in addition to r"" Syntax, for not escaping
backlash character in strings, also support """ """ (Python Like Syntax),
for also allowing to have within the character string the closing sequence
" symbol?

See Python's article on string literals for further information:

https://docs.python.org/2.0/ref/strings.html

Thanks!

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