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Full Discussion: Negation in Bash Globbing
Top Forums Shell Programming and Scripting Negation in Bash Globbing Post 302924473 by RudiC on Monday 10th of November 2014 07:38:03 AM
Old 11-10-2014
What RavinderSingh says is correct for regexes, but not for shell globbing. * itself is the wildcard character, matching any sequence of any chars.

So - *[^a]* will match anything followed by a non-"a" char followed by anything. that would exclude only filenames consisting of nothing but "a"s

---------- Post updated at 13:38 ---------- Previous update was at 10:52 ----------

As you are using bash, did you consider extended pattern matching? man bash:
Quote:
If the extglob shell option is enabled using the shopt builtin, several extended pattern matching operators are recognized.
. . .
!(pattern-list)
Matches anything except one of the given patterns
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