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

[qiaonuohan]

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.

-- 
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Regards
Qiao Nuohan

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