Relative Expression-Based Object Language, aka Relative Expression-Based Object Language, is an actively used programming language created in 1997.

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Example code from the Hello World Collection:

; Hello World in REBOL

print "Hello World!"

Example code from Linguist:

Rebol []
hello: func [] [
    print "hello, world!"
]
hello

Example code from Wikipedia:

Digit: charset [#"0" - #"9"]
Value: [some Digit | "(" Expr ")"]
Product: [Value any [["*"| "/"] Value]]
Sum: [Product any [["+"| "-"] Product]]
Expr: Sum
parse/all "12+13" Expr
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Last updated February 11th, 2019