dcl-cmd-rdcl-cmd-r is a variable defined in `
dcl-mode.el'. Its value is
"^\\$\\(.*-[ ]*\\(!.*\\)*\n\\)*[^!\"\n]*\\(\".*\\(\"\".*\\)*\"\\)*[^!\"\n]*"Documentation: Regular expression describing a DCL command line up to a trailing comment. A line starting with $, optionally followed by continuation lines, followed by the end of the command line. A continuation line is any characters followed by `-', optionally followed by a comment, followed by a newline. You can customize this variable.