in f13 =~ no longer working in bash

[Farkas Levente]

hi,
=~ no longer working in bash. just try this little line:
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if [[ "abc" =~ "abc.*" ]]; then echo inside; else echo outside; fi
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this give "inside" up to fedora-12, but it gives
"outside" in fedora-13.
imho it's a serious changes since all shell script will fail which use
=~ :-(
is there any reason for this? or any quick fixes?
thanks in advance.
regards.

-- 
  Levente                               "Si vis pacem para bellum!"