+
+string delim "'" "'" escape "\\"
+environment string delim "\"" "\"" begin
+ specialchar delim '\{' '\}'
+ specialchar = '\\.'
+end
+environment string delim '(\"{3})' '(\"{3})' escape "\\" multiline begin
+ specialchar delim '\{\{\{' '\}\}\}'
+ specialchar = '\\.'
+end
+