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/
   ^
...
   (?: .{0,3} | (?!bank}.{4} | .{5,} )
   $
/sx

/
   ^
...
   (?: | [^b].* | b[^a].* | ba[^n].* | ban[^k].* | bank.+ )
   $
/sx

/
   ^
...
   (?: (?!bank). )*
   $
/sx