Regular keywords

Regular keywords are keywords that can have a range of values.

They have the following form:
```
   Keyword name=keyword value
          or
   Keyword name-keyword value
```
The hyphen (-) and the equal sign (=) are keyword delimiters. No blanks are allowed between the keyword name, the delimiter (- or =), and the keyword value.
The keyword name can use only matching characters. The keyword value can use only character types, and lists (but not wildcard lists).

Examples

The following are examples of valid keyword parameters:

    KEY-aaaa
    KEY=aaaaaa

The following are examples of keyword parameters that are not valid:

    KEY - xxxxxxx   blank between KEY and hyphen; and blank between
                    hyphen and xxxxxx
    KEY -xxxxxx     blank between KEY and hyphen
    KEY= xxxxxx     blank between equal sign and xxxxxx
    KEY--xxxxxx     multiple occurrence of hyphen.

A regular keyword parameter can:

Match specific characters
The keyword name must match specific characters.
Example:
```
Grammar is: Key=cd.x

Input string for keyword name portion only:
 K
 KE
 KEY
```

Match character types: a, c, d, u, w, x, + and *

The keyword value can use character types.

Examples:

Grammar is: Key=cd
Keyword value: cd

Input string for cd can be:
 A1
 M1
 B5
 and so on...

Grammar is: KEY=d+++
Keyword value: d+++

Input string for d+++
can be 1 to 4 digits: 1 or 21, or 345, or 5555 and so on.

Be a list.

Only the keyword value can be a list.

Example:

Grammar is: KEYword=acd.xw
Keyword value is a list: acd.xw

Input string can be:
 For the whole list:  0A1.F*
 For the first item:  AB9.
 For the second item:  .0A