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If we talk to terminals that like colors, we need to ignore the vt100 escape sequences when matching strings. An unprocessed barebox console prompt would e.g. look like: ESC[1;32mbarebox@ESC[1;36mARM QEMU virt64:/ESC[0m where we cannot match for something like "barebox@ARM QEMU virt64:/". The same applies to colored Linux terminal output of course. The "\x1b\[" from the regex catches the standard start of ANSI escape sequence while the rest catches the actual command code executed. (From OE-Core rev: 33bbe4cb040f890121681865fbcf28bc8213a170) Signed-off-by: Enrico Jorns <ejo@pengutronix.de> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>