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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 DEBIAN

xzgrep

XZGREP(1)							     XZ Utils								 XZGREP(1)

NAME

       xzgrep - search compressed files for a regular expression

SYNOPSIS

       xzgrep [grep_options] [-e] pattern file...
       xzegrep ...
       xzfgrep ...
       lzgrep ...
       lzegrep ...
       lzfgrep ...

DESCRIPTION

       xzgrep  invokes	grep(1)  on  files which may be either uncompressed or compressed with xz(1), lzma(1), gzip(1), bzip2(1), or lzop(1).  All
       options specified are passed directly to grep(1).

       If no file is specified, then standard input is decompressed if necessary and fed to grep(1).  When reading from standard  input,  gzip(1),
       bzip2(1), and lzop(1) compressed files are not supported.

       If  xzgrep  is  invoked as xzegrep or xzfgrep then egrep(1) or fgrep(1) is used instead of grep(1).  The same applies to names lzgrep, lze-
       grep, and lzfgrep, which are provided for backward compatibility with LZMA Utils.

ENVIRONMENT

       GREP   If the GREP environment variable is set, xzgrep uses it instead of grep(1), egrep(1), or fgrep(1).

SEE ALSO

       grep(1), xz(1), gzip(1), bzip2(1), lzop(1), zgrep(1)

Tukaani 							    2011-03-19								 XZGREP(1)
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