A quite distinct descendant of snobol, developed by Griswold et al in 1967. SNOBOL4 is declarative with dynamic scope. Patterns are first-class data objects that can be constructed by concatenation and alternation. Success and failure are used for flow control. Delayed (unevaluated) expressions can be used to implement recursion. It has a table data type. Strings generated at run time can be treated as programs and executed.

See also vanilla.

["The SNOBOL4 Programming Language", Ralph E. Griswold et al, P-H 1971].