Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Paul,The following extended regular expression will match any 4 characters but "KWAL":
([^K]...|K[^W]..|KW[^A].|KWA[^L]) Regards, Steve Emmerson
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