[Crash-utility] [PATCH] add option -E for foreach

Hello Dave, The patch is used to add a new option, "-E regex", to perform the command(s) on all commands whose names contains a match to "regex". "regex" is interpreted as an POSIX extended regular expression. The new option is helpful when using to search some commands whose names are similar. And I think it is more reliable than "foreach <name> <command> | grep xxx", for information comes from command may have a match to "xxx". P.S. The patch uses some function defined in regex.h, which is offered by glibc. -- -- Regards Qiao Nuohan