Informix Onconfig parsing:

Comments: standard # delimted

Entry types:

1: KEY value
  a. most of the entries
2: KEY list,of,values
  a. NETTYPE,SHMVIRT_ALLOCSEG,CDR_EVALTHREADS,STORAGE_FULL_ALARM
3: KEY seckey=value,list=of,paired=data
  a. BTSCANNER
4: KEY mixed,of=1,and=of,2
  a. VPCLASS,BUFFERPOOL
5: KEY /path/to/lib:/path/to/altlib
  a: JVPCLASSPATH

KEY: Valid to contain [A-Z_]

Values: value to contain [a-z0-9/-.] and sometimes [A-Z]

List of pairs:
  seckey: Valid to contain [a-z_]
  secvalue: same as values