FIELD$( string1, nbr, string2 [, string3] )
Returns a particular field in a string with the fields separated by delimiters.
Note that a space character cannot be used as a delimeter.
nbr is the field to return (the first is nbr 1). string1 is the string to search and
string2 is a string holding the delimiters (more than one can be used). The
space character may not be used as a delimiter.
string3 is optional and if specified will include characters that are used to
quote text in string1 (ie, quoted text will not be searched for a delimiter).
For example: S$ = "foo, boo, zoo, doo" r$ = FIELD$(s$, 2, ",") will result in r$ = "boo". While: s$ = "foo, 'boo, zoo', doo" r$ = FIELD$(s$, 2, ",", "'") will result in r$ = "boo, zoo".