On Fri, 29 Dec 2017 07:05:29 -0800, sml...@gmail.com wrote: > These regexes parse and run fine (they match a single `#` character): > > /\#/; > /^\#/; > > But this one doesn't: > > /^ \#/; > > The error thrown, is: > > ===SORRY!=== > Regex not terminated. > at -e:1 > ------> /^ \#/⏏<EOL> > Unable to parse regex; couldn't find final '/' > at -e:1 > ------> /^ \#/⏏<EOL> > expecting any of: > infix stopper > > It's as if the parser fails to recognize that the `#` character was > escaped (interpreting the backslash as unspace maybe?), and treats > everything until the end of the line as a comment. > > This seems to be only happening when the escaped `#` character is > preceded by another token, *and* separated from it by whitespace. > > Apparently this bug has always existed in Rakudo: > https://gist.github.com/Whateverable/ca082a33d2ab689bf3ca4b6f7ae2d19f
Thank you for the report. This is a duplicate of https://github.com/rakudo/rakudo/issues/1324 The problematic cases are matched[^1] as unspaces. The `\#` thing was never meant[^2] to work, but it slipped through and now we probably have to deal with back-compat issues in order to fix it. [1] https://github.com/rakudo/rakudo/issues/1324#issuecomment-353233051 [2] https://github.com/rakudo/rakudo/issues/1324#issuecomment-353435175
