grammar example { #= `grammar` is Raku's construct for writing parsers token str-open { \" } # A practical parser might support other delims token str-close { \" } # including paired (balanced) quotes like “ and ” token code-open { \{ } # Assume interpolations are written like { ... } token code-close { \} } token string { <.str-open> <str-content> <.str-open> } rule interp { <.code-open> <code-content> <.code-close> } # `rule` automatically # handles whitespace token str-content { [ <interp> | <!str-close> . ]* } rule code-content { [ <string> | <!code-close> . ]* } } say example .parse: rule => 'string', '"outer string { "interpolated string { "nested interpolated string" } " } "'