[Bug 5090] sed and awk mishandle \b \< \B

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=5090

--- Comment #1 from Phil Carmody <pc+busybox at asdf.org> 2014-10-21 22:50:05 UTC ---
looks like it does affect busybox (e)grep too, but I agree that the error seems
to be inside the regex library itself:

phil at geespaz:busybox$ echo 'azz bz c d' | ./busybox egrep -o '\b[a-z]'
a
z
z
b
z
c
d
phil at geespaz:busybox$ echo 'azz bz c d' | egrep -o '\b[a-z]'
a
b
c
d

My regex library is:
phil at geespaz:busybox$ nm ./busybox_unstripped | grep regexec
         U regexec@@GLIBC_2.3.4

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