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.
SNOBOL 4.
ftp://apple.com/ArchiveVol1/Unix_lang.
["The SNOBOL4 Programming Language", Ralph E. Griswold et al,
P-H 1971].