RegEx This but not that

[Robert Or Janet Diebel]

I wish to search text for all two character words, and then eliminate “mu, ku, ha, ou”

{space}[a-zA-Z][a-zA-Z]{space} works to find all.
How do I get rid of the above ones

[Mark Olson]

@Robert-Or-Janet-Diebel
Try (?-i)\b(?!mu|ku|ha|ou)[a-zA-Z]{2}\b (replace the \b with \s+ if you want to match surrounding space too)

[Robert Or Janet Diebel]

@Mark-Olson Thanx. Your time and effort is much appreciated