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Full Discussion: Grep words with X doubles only
Top Forums UNIX for Dummies Questions & Answers Grep words with X doubles only Post 302825171 by sudon't on Sunday 23rd of June 2013 09:03:22 PM
Old 06-23-2013
Grep words with X doubles only
Hi!
I'm trying to figure out how to find words with X number of doubles, only. I'm searching a dictionary, (one word per line). For instance, if you want to find words containing only one pair of double letters, you could do something like this:
Code:
egrep '(.)\1' wordlist.txt |egrep -v '(.)\1.*(.)\2'

That'll get rid of words with two, or more, doubles. But when you want to search for two or three sets of doubles, it gets a bit unwieldy.
Code:
egrep '(.)\1.*(.)\2' wordlist.txt |egrep -v '(.)\1.*(.)\2.*(.)\3'

And so on...
It seems to me that there must be a way to specify the max number of doubles in a single regex, but I cannot figure out how. I've found a number of pages online that talk about finding doubles, but none of them mention how to limit them to only the desired amount. I thought maybe a negative backreference could do it but, either I'm writing it wrong, or it just doesn't work. I still get words with more than X doubles.
Code:
$ grep -P '(.)\1.*(?!\1)' twl |head
aa
aah
aahed
aahing
aahs
aal
aalii
aaliis
aals
aardvark

$ grep -P '^(.)\1.*(?!(.)\1)$' twl |head
aa
aah
aahed
aahing
aahs
aal
aalii
aaliis
aals
aardvark

And I tried a bunch of other stuff, but can't figure it out, so I'm turning to you all.
 

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LEARN ABOUT OPENSOLARIS

mkpwdict

mkpwdict(1M)						  System Administration Commands					      mkpwdict(1M)

NAME

       mkpwdict - maintain password-strength checking database

SYNOPSIS

       /usr/sbin/mkpwdict [-s dict1,... ,dictN]
	    [-d destination-path]

DESCRIPTION

       The mkpwdict command adds words to the dictionary-lookup database used by pam_authtok_check(5) and passwd(1).

       Files containing words to be added to the database can be specified on the command-line using the -s flag. These source files should have a
       single word per line, much like /usr/share/lib/dict/words.

       If -s is omitted, mkpwdict will use the value of DICTIONLIST specified in /etc/default/passwd (see passwd(1)).

       The database is created in the directory specified by the -d option. If this option is omitted, mkpwdict uses  the  value  of  DICTIONDBDIR
       specified in /etc/default/passwd (see passwd(1)). The default location is /var/passwd.

OPTIONS

       The following options are supported:

       -s    Specifies a comma-separated list of files containing words to be added to the dictionary-lookup database.

       -d    Specifies the target location of the dictionary-database.

FILES

       /etc/default/passwd    See passwd(1).

       /var/passwd	      default destination directory

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       passwd(1), attributes(5), pam_authtok_check(5)

SunOS 5.11							    1 Jun 2004							      mkpwdict(1M)
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