You can use look-behind assertions for that: 

/
    ([A-Z.]*
    (?<!DI\.PRODUCT\.HIERARCHY\.IMPORT\.)
    (?<!DI\.CATSETUP\.PRODUCT\.IMPORT\.)
    BO)
/x

[download]
This will match only if the part behind 'BO' is not one of your special cases.

In reply to Re: Regex to match with exclusions by kroach
in thread Regex to match with exclusions by fazedandconfused

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