I think this may be a shell lexer issue
as a workaround try
~(E)a[+]a
On Sat, 03 Jan 2009 18:00:45 +0100 Roland Mainz wrote:
> ----
> I've been trying to escape a '+' character in an extended regular
> pattern but somehow fail to get it working:
> -- snip --
> $ ksh93 -c 'a="a+a" ; [[ "$a" == ~(E)a+a ]] && print
> ok'
> $ ksh93 -c 'a="a+a" ; [[ "$a" == ~(E)a\+a ]] && print
> ok'
> $ ksh93 -c 'a="a+a" ; [[ "$a" == ~(E)a\\+a ]] && print ok'
> -- snip --
> Using ~(G) as workaround seems to work in this case but I need ~(E)
> patterns in this case... ;-(
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