On Thu, Jan 16, 2014 at 03:46:38PM -0800, Eduardo A. Bustamante López wrote: > [[ $'\a' =~ $'\a' ]] -> 0 > [[ $'\a' =~ $'\\\a' ]] -> 0 > [[ $'\a' =~ $'\\[\a]' ]] -> 1 > --- > [[ $'\177' =~ $'\177' ]] -> 0 > [[ $'\177' =~ $'\\\177' ]] -> 1 > [[ $'\177' =~ $'\\[\177]' ]] -> 1
> Notice that only $'\177' seems to fail in the middle case, while the > others work just fine. Maybe I'm missing something, but why do you consider that to be wrong? I would expect [[ x =~ yx ]] to fail (return 1) every time. In fact I'd consider this result: > [[ $'\a' =~ $'\\\a' ]] -> 0 to be wrong. And in fact, on my version of bash I get a different result: imadev:~$ [[ $'\a' =~ $'\\\a' ]] ; echo $? 1 imadev:~$ echo $BASH_VERSION 4.3.0(1)-beta2 I get a return value of 1 in every version of bash I tried except bash 3.1, which returns 0, and bash 2.05b, which gives a syntax error because it doesn't have =~ yet.
