EditPlus (as of v3.11) build 421 (2009-08-08) now supports an option to allow proper syntax highlighting of nested comments.
The following is an example of what a nested comment would look like in the Progress ABL programming language:
/* This is a comment /* This is another comment */ End of the first comment */
Use the #NESTED_COMMENT=y syntax file statement for nested comments in your syntax file. For Progress ABL it looks like:
#NESTED_COMMENT=y #COMMENTON=/* #COMMENTOFF=*/