Regular expression compile failed (bad class)

Cloned and `make install` latest version but can't seem to get it to work on a just installed Debian 9.4 machine.

```
# ls -la test.bin
-rw-r--r-- 1 root root 1073741824 Aug 8 13:09 test.bin

(on another terminal, performing a copy on test.bin)

# pmonitor --file=test.bin
awk: line 12: regular expression compile failed (bad class -- [], [^] or [)
^/dev/[^
awk: line 12: syntax error at or near ]
awk: line 12: runaway regular expression / && system ...
```

Attempting to run tests:
```
~/pmonitor# ./test-pmonitor.sh
awk: line 12: regular expression compile failed (bad class -- [], [^] or [)
^/dev/[^
awk: line 12: syntax error at or near ]
awk: line 12: runaway regular expression / && system ...
FAIL pmonitor: expected 50, got ''
```