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Full Discussion: Does Sed Search/Replace Work For Multiple Matches On The Same Line?
Top Forums Shell Programming and Scripting Does Sed Search/Replace Work For Multiple Matches On The Same Line? Post 302322263 by rubin on Wednesday 3rd of June 2009 08:28:18 AM
Old 06-03-2009
Quote:
Originally Posted by cibalo
...
The above sed script works only for the line containing only 1x font tag pairs. It looks to me that sed only finds the longest match on the line. For the lines containing more than one font tag pairs, my sed script doesn't work. It deletes some useful data on the line. What am I missing?
...
As far as I know, sed doesn't support RE's non-greedy match ..., try a different tool that supports it:

Code:
perl -0pe 's!<FONT.*?</FONT>!!gs' file

Output:

Code:
1. The quick brown fox jumps over the lazy dog. -- this is correct line<br>
2. The quick brown fox jumps over the lazy dog. -- 1x FONT Tag Pairs<br>
3. The quick brown fox jumps over the lazy dog. -- 2x FONT Tag Pairs<br>
4. The quick brown fox jumps over the lazy dog. -- 3x FONT Tag Pairs<br>

 

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LEARN ABOUT DEBIAN

shtool-subst

SHTOOL-SUBST.TMP(1)					      GNU Portable Shell Tool					       SHTOOL-SUBST.TMP(1)

NAME

       shtool-subst - GNU shtool sed(1) substitution operations

SYNOPSIS

       shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext]
       [-e|--exec cmd] [-f|--file cmd-file] [file] [file ...]

DESCRIPTION

       This command applies one or more sed(1) substitution operations to stdin or any number of files.

OPTIONS

       The following command line options are available.

       -v, --verbose
	   Display some processing information.

       -t, --trace
	   Enable the output of the essential shell commands which are executed.

       -n, --nop
	   No operation mode. Actual execution of the essential shell commands which would be executed is suppressed.

       -w, --warning
	   Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution
	   operations resulted in no content change on all files.

       -q, --quiet
	   Suppress warning on substitution operation resulting in no content change.

       -s, --stealth
	   Stealth operation. Preserve timestamp on file.

       -i, --interactive
	   Enter interactive mode where the user has to approve each operation.

       -b, --backup ext
	   Preserve backup of original file using file name extension ext.  Default is to overwrite the original file.

       -e, --exec cmd
	   Specify sed(1) command directly.

       -f, --file cmd-file
	   Read sed(1) command from file.

EXAMPLE

	#   shell script
	shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch]

	#    RPM spec-file
	%install
	    shtool subst -v -n 
		-e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g' 
		-e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g' 
		`find . -name Makefile -print`
	    make install

HISTORY

       The GNU shtool subst command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 2001 for GNU shtool.  It was prompted
       by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications.

SEE ALSO

       shtool(1), sed(1).

18-Jul-2008							   shtool 2.0.8 					       SHTOOL-SUBST.TMP(1)
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