[[ str =~ "^pattern" ]] no longer works

[flong]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-unknown-linux-gnu' 
-DCONF_VENDOR='unknown' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' 
-DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib  -D_GNU_SOURCE 
-DRECYCLES_PIDS  -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions 
-fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic
uname output: Linux dell1 2.6.32-71.el6.x86_64 #1 SMP Fri May 20 03:51:51 BST 
2011 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-unknown-linux-gnu

Bash Version: 4.1
Patch Level: 2
Release Status: release

Description:

    The [[ str =~ "^pattern" ]] operator no longer works correctly.  "^"
    is treated as a literal instead of matching the beginning of the line.

Repeat-By:

    [[ "-h" =~ '^-h' ]] ; echo $?
    Should return 0, but instead returns 1.