I was trying to add a "New Line comment" for a user defined language and I'm seeing something odd. If I add "Use delimiter": "2:" or "1:" then hit Apply then OK. The line comment does not work. When I return to check the setting I find the "2:" has changed to "2+" and the "1:" has changed to "1+". Is there something special about having a number then a colon? Does this delimiter support regular expressions or something of the sort? A regular expression would be a welcome development.
[Ubuntu 14.04, SE 19.0.0.14 64-bit]