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Full Discussion: Delete a pattern including any whitespace before it and after it
Top Forums Shell Programming and Scripting Delete a pattern including any whitespace before it and after it Post 303042623 by jcdole on Wednesday 1st of January 2020 12:42:29 PM
Old 01-01-2020
Delete a pattern including any whitespace before it and after it
Hello.

Code:
A_LIGNE="cnezJ,V ,FMZ  fd,Mok CODKJ,F  SOME_WORD   fcnQ, VMQKV Q"
A_PATTERN="SOME_WORD"

Code:
sed 's/'$A_PATTERN'//g' <<< "$A_LINE"

will remove 'SOME_WORD' and give :
Code:
"cnezJ,V ,FMZ  fd,Mok CODKJ,F    fcnQ, VMQKV Q"

A_PATTERN="SOME_WORD[[:space:]]"
Code:
sed 's/'$A_PATTERN'//g' <<< "$A_LINE"

will remove 'SOME_WORD' and the space after it and give :
Code:
"cnezJ,V ,FMZ  fd,Mok CODKJ,F  fcnQ, VMQKV Q"

Now the question

--------------------------

My problem is that the pattern is at the beginning of the line

I would like to remove the whitespace before and after it.
I tried this :
A_PATTERN="[[:space:]]SOME_WORD[[:space:]]"
Code:
sed 's/'$A_PATTERN'//g' <<< "$A_LINE"

should remove 'SOME_WORD' and the space before and after it.
But it does not work.
The pattern is at the beginning of the line and have white space after it.
But may or may not have white space before it.

ps (I made a try on a file where the pattern start at the beginning of the line without white space before it.)

Any help is welcome
 

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LEARN ABOUT OSX

locale::codes::langext

Locale::Codes::LangExt(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangExt(3pm)

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) 2011-2012 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.2							    2012-10-11					       Locale::Codes::LangExt(3pm)
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