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Homework and Emergencies Homework & Coursework Questions find grep sed commands homework Post 302493412 by ctsgnb on Wednesday 2nd of February 2011 04:26:25 PM
Old 02-02-2011
I give another one :

Code:
$ echo "jfaghkjfhadglkjaaaadfgdffffffdddttttmmmm" | sed 's/\(.\)\1*/\1/g'
jfaghkjfhadglkjadfgdfdtm

sed 's/\(.\)\1*/\1/g' explanations :

s/pattern1/pattern2/g substitute pattern1 with pattern2 in a global manner (even if pattern1 occurs more than once in a line
.matches any single character
\( \) what is inside these backslash protected parenthesis is stored in the string \1
\1 refer to what has just been matched
* what is just before is repeated 0 or more times
\1 stand for the pattern2 which refer to the matched caracter

If you want to remove only adding successive occurrenc of ... let's say only letters a or t :

Code:
$ echo "jfaghkjfhadglkjaaaadfgdffffffdddttttmmmm" | sed 's/\([at]\)\1*/\1/g'
jfaghkjfhadglkjadfgdffffffdddtmmmm


Last edited by ctsgnb; 02-02-2011 at 05:41 PM..
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Locale::Codes::LangExt(3)				User Contributed Perl Documentation				 Locale::Codes::LangExt(3)

NAME
Locale::Codes::LangExt - standard codes for language extension identification SYNOPSIS
use Locale::Codes::LangExt; $lext = code2langext('acm'); # $lext gets 'Mesopotamian Arabic' $code = langext2code('Mesopotamian Arabic'); # $code gets 'acm' @codes = all_langext_codes(); @names = all_langext_names(); DESCRIPTION
The "Locale::Codes::LangExt" module provides access to standard codes used for identifying language extensions, such as those as defined in the IANA language registry. Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default IANA language registry codes will be used. SUPPORTED CODE SETS
There are several different code sets you can use for identifying language extensions. A code set may be specified using either a name, or a constant that is automatically exported by this module. For example, the two are equivalent: $lext = code2langext('acm','alpha'); $lext = code2langext('acm',LOCALE_LANGEXT_ALPHA); The codesets currently supported are: alpha This is the set of three-letter (lowercase) codes from the IANA language registry, such as 'acm' for Mesopotamian Arabic. This is the default code set. ROUTINES
code2langext ( CODE [,CODESET] ) langext2code ( NAME [,CODESET] ) langext_code2code ( CODE ,CODESET ,CODESET2 ) all_langext_codes ( [CODESET] ) all_langext_names ( [CODESET] ) Locale::Codes::LangExt::rename_langext ( CODE ,NEW_NAME [,CODESET] ) Locale::Codes::LangExt::add_langext ( CODE ,NAME [,CODESET] ) Locale::Codes::LangExt::delete_langext ( CODE [,CODESET] ) Locale::Codes::LangExt::add_langext_alias ( NAME ,NEW_NAME ) Locale::Codes::LangExt::delete_langext_alias ( NAME ) Locale::Codes::LangExt::rename_langext_code ( CODE ,NEW_CODE [,CODESET] ) Locale::Codes::LangExt::add_langext_code_alias ( CODE ,NEW_CODE [,CODESET] ) Locale::Codes::LangExt::delete_langext_code_alias ( CODE [,CODESET] ) These routines are all documented in the Locale::Codes::API man page. SEE ALSO
Locale::Codes The Locale-Codes distribution. Locale::Codes::API The list of functions supported by this module. http://www.iana.org/assignments/language-subtag-registry The IANA language subtag registry. AUTHOR
See Locale::Codes for full author history. Currently maintained by Sullivan Beck (sbeck@cpan.org). COPYRIGHT
Copyright (c) 2011-2013 Sullivan Beck This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.16.3 2013-02-27 Locale::Codes::LangExt(3)
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