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Top Forums Shell Programming and Scripting Non-greedy pattern matching in shell script Post 302910867 by Chubler_XL on Monday 28th of July 2014 04:50:51 PM
Old 07-28-2014
Try replacing your <tag> and </tag> with two single characters like ~ and @

You can then use [^~]*. Just incase these two special characters appear in the input replace them with two unique strings and replace these back when done:

Code:
sed -r -e "s,~,UNIQUE_STR1,g" \
    -e "s,@,UNIQUE_STR2,g" \
    -e "s,<${2}>,~,g" \
    -e "s,</${2}>,@,g" \
    -e "s/([^~]*~){$3}([^@]*)@.*/\2/" \
    -e "s,UNIQUE_STR1,~,g" \
    -e "s,UNIQUE_STR2,@,g" ${1}

This assumes the whole document is on 1 line which is likely to cause issues with sed when your XML gets large so it's not ideal, but a good example of the concept.

Another approach is to use the awk Record Separator (RS) by replacing the start and end tags with a single character:

Code:
sed -e "s,~,UNIQUE_STR,g" \
    -e "s,<${2}>,~,g" \
    -e "s,</${2}>,~,g" ${1} | \
awk "NR==${3}*2" RS=\~ | \
sed -e "s,UNIQUE_STR,~,g"

Now, awk can simply select the N*2 record for the required data.

Again we replace the UNIQUE_STR with ~ for the final result.

Last edited by Chubler_XL; 07-28-2014 at 06:09 PM.. Reason: Rewording to make concept clearer
 

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CG(1)																	     CG(1)

NAME
cg - Recursively grep for a pattern and store it. SYNOPSIS
cg [ -l ] | [ [ -i ] pattern [ files ] ] DESCRIPTION
cg does a search though text files (usually source code) recursively for a pattern, storing matches and displaying the output in a human- readable fashion. It is intended to give some of the functionaly of AT&T's cscope(1) tool, with the advantages of simplicity and not being language-specific. The script will colorize output if configured as such. It is typically run with a Perl regular expression to search for. The search can be made case insensitive by using the -i option. A list of files may also be specified with an additional argument after the pattern. Put the files pattern in quotes to make it be matched by Perl rather than by the shell. Running the script with no arguments will recall the results of the previous search. After the search, entries found can be edited using the vg(1) script. The -l option shows the last log made. SOME EXAMPLES
cg - alone recalls the previous search results. cg -i pattern - search the default list of files for all files matching the pattern (and case-insensitively). cg pattern '*.c' - search recursively for pattern in all *.c files. This automatically converts '*' to '.*' and '.' to '.' for you and does a Perl pattern match on all files in the tree. cg pattern *.c - search through the shell-expanded list of *.c files, so not done recursively (in other words, only the files your shell pass to the script as arguments). cg -l - show the last log made. COMMAND-LINE OPTIONS -i Do a case-insensitive search. -l Show the last log made. -p Toggle the default pager option. cg has a bulit-in pager function, which can be enabled or disabled by default (in .cgvgrc). If the default is enabled, this option disables the pager; if the default is disabled, this option enables it. -P Force the built-in pager to be disabled. FILES
${HOME}/.cglast Log file of the last search. ${HOME}/.cgvgrc Per-user configuration file (if the defaults are not desireable). ${HOME}/.cgvg/* Log files in $HOSTNAME.shell_pid form with the log of the last search. SEE ALSO
vg(1), perl(1), find(1), grep(1), cscope(1) AUTHOR
cg was written by Joshua Uziel <uzi@uzix.org>. 13 Mar 2002 CG(1)
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