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Full Discussion: GREP function in ksh which ignores LINE Breaks
Top Forums UNIX for Dummies Questions & Answers GREP function in ksh which ignores LINE Breaks Post 302918069 by drl on Saturday 20th of September 2014 04:00:48 PM
Old 09-20-2014
Hi.

For portability (but not performance), there is a perl version of grep, peg, that has many features, including the ability to use perl expressions and functions. The near functions allow one to look backwards from a line which matched a pattern, effectively matching across lines:
Code:
#!/usr/bin/env bash

# @(#) s2	Demonstrate match across lines, peg.
# For peg source, see:
# # http://www.cpan.org/authors/id/A/AD/ADAVIES/peg-3.10

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C peg

FILE=${1-data1}

pl " Input data file $FILE:"
cat $FILE

pl " Results, peg for RITE AID back to ST*82 across lines:"
peg -l '/RITE AID/ and near(sub{/ST\*82/},-1)' $FILE

exit 0

producing:
Code:
$ ./s2

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian 5.0.8 (lenny, workstation) 
bash GNU bash 3.2.39
peg (local) 3.10

-----
 Input data file data1:
ISA*00* 00 *ZZ*NATIONSBANK *14*0030020520500 *140918*1200*U*00401*000006436*0*P*^ 
GS*RA*014578892*IGIHCJEEJ*20140918*1200*6442*X*004010
ST*820*000006482 
N1*PR*RITE AID HDQTRS. CORP.*1*014578892

-----
 Results, peg for RITE AID back to ST*82 across lines:
data1

The peg code has many of the same basic options as GNU grep, in addition to a number of extensions. For basic work on systems that do not have GNU grep it seems to be an acceptable substitute in many situations. The comment in the shell script points to the code source.

Best wishes ... cheers, drl
 

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LEARN ABOUT MOJAVE

pt_peg_import_container

pt::peg::import::container(n)					   Parser Tools 				     pt::peg::import::container(n)

__________________________________________________________________________________________________________________________________________________

NAME

       pt::peg::import::container - PEG Import Plugin. From CONTAINER format

SYNOPSIS

       package require Tcl  8.5

_________________________________________________________________

DESCRIPTION

       Are  you  lost  ?  Do you have trouble understanding this document ?  In that case please read the overview provided by the Introduction to
       Parser Tools. This document is the entrypoint to the whole system the current package is a part of.

       This package does not exist.  There is no need for it.  The CONTAINER format for parsing expression grammars is a piece of Tcl code  which,
       then sourced, provides a class whose instances have the grammar we wish to import loaded.  Another way of looking at this is, the CONTAINER
       output is its own import package.

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the  category  pt	of
       the  Tcllib  SF	Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you may have for
       either package and/or documentation.

KEYWORDS

       EBNF, LL(k), PEG, TDPL, context-free languages, expression, grammar, matching, parser, parsing expression, parsing expression grammar, push
       down automaton, recursive descent, state, top-down parsing languages, transducer

CATEGORY

       Parsing and Grammars

COPYRIGHT

       Copyright (c) 2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>

pt									 0					     pt::peg::import::container(n)
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