UDL (User-defined language) request 4: variable string matching (HEREDOC)

[Mikhail Nikitin]

How to emphasize a HEREDOC syntax?

For those unaware of this term, it is a way to wrap long lines. The first line should end with <<Name, where Name is any string, then some lines follow, and the last line shall be Name. The first Name can be highlighted with “prefix” syntax. The trick here is to highlight the second Name.

Example

ADD( <<END
1, 
2
)
END

is equivalent to

ADD(1, 2)

See also https://en.wikipedia.org/wiki/Here_document