##-
# Author: Brian Tiffin
# Dedicated to the public domain
#
# Date: November 2016
# Modified: 2016-11-27/22:12-0500
##+
#
# Pos.icn, SNOBOL pattern matching function, test position
#
procedure main()
    # Pattern matching positional test
    "string" ?? Span('pqrstuv') => first || Pos(4) || Tab(0) => rest
    write(image(first), " ", image(rest))

    # enforce anchored pattern matching with unachored Span
    "no match at start of string" ?? Pos(1) || Span('rst') => second
    # second will be unset
    write(image(second))

    # same again, without positional test, Span allowed to scan forward
    "ok, no match at start of string" ?? Span('rst') => third
    write(image(third))
end