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Full Discussion: Deleting all but a regex using sed, tr, cut etc
Top Forums UNIX for Dummies Questions & Answers Deleting all but a regex using sed, tr, cut etc Post 302550867 by Pureferret on Sunday 28th of August 2011 08:08:55 AM
Old 08-28-2011
Question Deleting all but a regex using sed, tr, cut etc
Hi guys, this is my first post, though I've been looking around the forums for a while trying to find a solution to my problem. I want to be able to take a several lines of text (an out put from get-iplayer and ls to be precise) and only keep the crazy alphanumerical code in each line. For example:

Quote:
Originally Posted by get-iplayer
b011rf7y: Doctor Who: Series 6 - 7. A Good Man Goes to War
b0146h0q: Doctor Who: Series 6 - 8. Let's Kill Hitler
and also

Quote:
Originally Posted by ls
Doctor_Who_Confidential_Series_5_-_8._After_Effects_b00sj9qj_default.flv
Doctor_Who_Series_5_-_8._The_Hungry_Earth_b00sj9sq_default.flv
Doctor_Who_Series_6_-_1._The_Impossible_Astronaut_b010tb7q_default.flv
All I want to do is extract the codes (e.g. b011rf7y, b00sj9qj), so I can compare them.

I've tried using Sed, tr, and cut but I can't seem to get the right output (though I can do plenty of other neat things). Which of these should I be using? I think my regex is
Code:
'((?:[a-z][a-z]*[0-9]+[a-z0-9]*))'

but I'm not sure (from txt2re.com by the way)
 

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LEARN ABOUT HPUX

hp-mc680x0

machid(1)						      General Commands Manual							 machid(1)

NAME

       machid: hp9000s200, hp9000s300, hp9000s400, hp9000s500, hp9000s700, hp9000s800, hp-mc680x0, hp-pa, pdp11, u370, u3b, u3b10, u3b2, u3b5, vax
       - provide truth value about processor type

SYNOPSIS

DESCRIPTION

       The following commands return a true value (exit code 0) if the a processor type matches the command name.  Otherwise a false  value  (exit
       code  nonzero)  is returned.  These commands are commonly used within makefiles and shell procedures to improve portability of applications
       (see make(1)).

				       +-----------+-------------------------++--------+--------------------------+
				       |Command    | True for		     ||Command | True for		  |
				       +-----------+-------------------------++--------+--------------------------+
				       |hp9000s200 | Series 200 	     ||pdp11   | PDP-11/45 or PDP-11/70   |
				       |hp9000s300 | Series 300 	     ||u3b     | 3B20 computer		  |
				       |hp9000s400 | Series 400 	     ||u3b2    | 3B2 computer		  |
				       |hp9000s500 | Series 500 	     ||u3b5    | 3B5 computer		  |
				       |hp9000s700 | Series 700 	     ||u3b10   | 3B10 computer		  |
				       |hp9000s800 | Series 800 or 700	     ||u370    | IBM System/370 computer  |
				       |hp-mc680x0 | Series 200, 300, or 400 ||vax     | VAX-11/750 or VAX-11/780 |
				       |hp-pa	   | Series 700 or 800	     ||        |			  |
				       +-----------+-------------------------++--------+--------------------------+
EXAMPLES

       Given a shell script that must behave differently when run on an HP 9000 Series 700 or 800 system, select the correct code  segment  to	be
       executed:

WARNINGS

       always  returns	true on both Series 800 and Series 700 systems.  Therefore, when using this command in scripts to determine hardware type,
       always use both and in the appropriate sequence to ensure correct results (see

       machid(1) will no longer provide support for future machines beyond the Series 800 and Series 700 systems.  Decisions should  be  based	on
       the hardware and software configuration information returned by getconf(1).

SEE ALSO

       getconf(1), make(1), sh(1), test(1), true(1).

																	 machid(1)
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