Yes, but:

Pike v9.0 release 2 running Hilfe v3.5 (Incremental Pike Frontend)

object buf = Stdio.Buffer("#"); buf->match("x");

(1) Result: 0

buf = Stdio.Buffer("#");

(2) Result: _static_modules._Stdio()->Buffer(1 bytes, read=[..-1] data=[0..0] free=[1..0] string)

buf->match("#");

(3) Result: ""

buf = Stdio.Buffer("#");

(4) Result: _static_modules._Stdio()->Buffer(1 bytes, read=[..-1] data=[0..0] free=[1..0] string)

buf->match("#%d");

(5) Result: ""

buf = Stdio.Buffer("#44");

(6) Result: _static_modules._Stdio()->Buffer(3 bytes, read=[..-1] data=[0..2] free=[3..0] string)

buf->match("#%d");

(7) Result: 44

This seems mildly inconsistent. If a fixed string in the pattern counts as a "match" with a value of "", then definitely I would expect it to be included in the sum.