wrote...
I am new to regular expressions and trying to understand a little
better. I have a formula that Ron Rosenfeld wrote The first one will
Parse the middle initial followed by a dot (A.) and the second one
will parse the middle initial the (A) .How do I get one formula to
parse a middle initial if it has a . or not?
....
Jim A. Jones
Jim A Jones

=REGEX.MID(TRIM(A2),"(?<=\s)(\w.+\s)+")

=REGEX.MID(TRIM(A3),"(?<=\s)(\w+\s)+")

These aren't robust, and they include trailing spaces. The following will
give all middle initials, names, whatever, without trailing spaces.

=REGEX.SUBSTITUTE(A1,"^\s*\S+\s*(.+)*\s+\S+\s*$","[1]")

If you want only initials,

=REGEX.SUBSTITUTE(REGEX.SUBSTITUTE(A1,"^\s*\S+\s*( .+)*\s+\S+\s*$","[1]"),
"\S+[^\s.]\s*","")