Add regular expression argument handling

[rwxrob]

Now that we have fields working fine, we need to expand and allow
developers to create ArgsPEGN and/or ArgsRegex rather than using
seek. This allows any number of sloppy variations to work so that
conversational UIs can easily be used without difficulty when saying
something is too hard. In fact, we could just add a special Aliases
value. If the string begins with / then treat it as a compiled regular
expression. Let's see getopt beat that shit.