Issue #8714 has been updated by phluid61 (Matthew Kerwin). Eregon (Benoit Daloze) wrote: > Why not Regexp.new('simple quoted string or any literal not interpolating')? That would have to be Regexp.new(%q/.../) to avoid having to escape single quotes and double-escape backslashes in the string literal.. which is pretty obtuse. > Also, > /[$#]/ # => /[$#]/ and > "[#$]" => "[\#$]" are fine on 2.0 and later. > > (Although "[#$]".inspect should probably not escape '#' but it is harmless) Off the top of my head, I can't think of how to construct a regexp literal to match a hash character at the end of the string (i.e. /#$/), without first constructing a string. ---------------------------------------- Feature #8714: Non-interpolated regular expression literal https://bugs.ruby-lang.org/issues/8714#change-40779 Author: phluid61 (Matthew Kerwin) Status: Open Priority: Normal Assignee: Category: core Target version: =begin I propose a new %string for non-interpolated regexp literals: %R It is common to see erroneous bug reports around the use of ((%#%)) in regexp literals, for example where (({/[$#]/})) raises a syntax error "unexpected $undefined", and this confuses people. The only solution is to rearrange the regular expression (such as (({/[$#]/}))), which is not always desirable. An non-interpolated regexp, such as (({%R/[$#]/})), would allow a much simpler resolution. === Known Issues * the capitalisation is the opposite of %Q(interpolated) and %q(uninterpolated) * %R was also proposed for literal Rationals in #8430, although I believe this has been superseded by the (({1.2r})) syntax =end -- http://bugs.ruby-lang.org/