A couple minor suggestions:
Nesting is not needed.
The "\s+.*" at the end does nothing.
/\!(\S+?)             #tablename
 \[(.*?)\]            #table variables
 (?:\[(.*?)\])?
 (?:\[(.*?)\])?
 (?:\[(.*?)\])?
/x

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In reply to Re^2: Regex - backreferencing multiple matches in one group. by Anonymous Monk
in thread Regex - backreferencing multiple matches in one group. by why_bird

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