Re: Match Ip Address on cmd line

[NetWallah]

This 'quick and dirty' regex will work reasonably well for "reasonable" data:

    perl -ne 'print qq|$1\n| if m/^\s*((?:\d{1,3}\.){3}\d{1,3})\s*$/'

It is tolerant of leading and trailing white-space, but does not check for octets being under 255, or being all zero at the first octet. There are "standard regex" Regexp::Common modules that do a more thorough check for IPv4 validity.

[sans-clue]

thanks so much, does the trick. what does qq mean ?

Also, yes I know this isn't a code writing service, but I could not find an 'if m/...' example in a command line, plus I would have never come up with 2 |'s

[halley]

The things you ask about are partly about style choices.

Equivalent:

do_something() if <condition>;
if (<condition>) { do_something(); }

Equivalent:

m[regex]
m|regex|
m/regex/
/regex/

Equivalent:

"string-with-expanded-$variables"
qq[string-with-expanded-$variables]
qq/string-with-expanded-$variables/

Using qq// is common on command lines, since the shell itself may require quotes or double-quotes.

Equivalent:

'string-expanding-no-variables'
q[string-expanding-no-variables]
q/string-expanding-no-variables/

All of this can be found in perldoc perlsyn and perldoc perlop.

[sans-clue]

veddy nice I like. thanks

[RyuMaou]

thanks so much, does the trick. what does qq mean ?

http://lmgtfy.com/?q=perl+qq
http://perldoc.perl.org/perlop.html#Quote-Like-Operators