Use this to search and replace text within Classic Salesforce Knowledge Articles. It is globally replaces a string using a perl regular expression and writes to STDOUT only those articles that have been changed.

ka-replace.sh

#!/bin/bash

if [ ! -n "$1" ]
then
	help_text=$( cat <<ENDxxx
Use this to search and replace text within Classic Salesforce Knowledge 
Articles. It is globally replaces a string using a perl regular expression
and writes to STDOUT only those articles that have been changed.

Usage: $0 "/search/replace-regexp/" input-file.csv [prefix] [--debug]
  where
    "search/replace-regexp" is a (perl) regular expression, including the
        search expression and replacement expression. This expression
        must be quoted and in the form "/search/replace/",
        where "search" is the regexp to be found, "replace" is what
        will replace it. This will become a perl search/replace command
        of the form 's/search/replace/g'. The regular expression
        should be able to support any perl regular expression.
        See https://perldoc.perl.org/perlrequick.html for details
        about regular expression syntax
    input-file.csv is an extract of Classic Knowledge Articles from
        Salesforce in the form of "Id","Article_content". The expectation
        is that each record begins with the "Id" column
    prefix is an optional string to prepend to the final output file name.
        If none is provided then this will be 'Replaced_'
    --debug outputs only the final perl expression to be run without
        actually doing anything.
$0 will
  remove all line breaks (collapsing into a single line, outputting
    intermediate temp file chomped.csv)
  introduce line breaks ahead of head article Id (making the CSV one article 
    per line, outputting intermediate temp file one-per-line.csv)
  invoke the aforementioned search and replace, writing the final output 
  to a new file entitled as Replaced-input-file.csv (the input file name 
  prefixed with 'Replaced-', or with the prefix text if provided.)
ENDxxx
)
	echo "$help_text"
	exit
else
    REGEXP=$1
fi

if [ ! -n "$2" ]
then
    echo "You must provide an input CSV file."
    exit
else
    INFILE=$2
fi

if [ ! -n "$3" -o '--debug'="$3" ]
then
    OUTNAME="Replaced_$2"
else
    OUTNAME="$3$2"
fi

if [ -n "$4" -o '--debug'="$3" ]
then
    DEBUG=1
fi

PERLSCRIPT="if(\$_ =~ s${REGEXP}g){print;}"
PERLINVOKE="perl -ne '$PERLSCRIPT' one-per-line.csv > \"$OUTNAME\""

if [ '1'="$DEBUG" ]
then
    echo $PERLINVOKE
    exit
else
    perl -pe "chomp;" "$INFILE" > chomped.csv
    perl -pe 's/"ka1/\n"ka1/sg;' chomped.csv > one-per-line.csv
    eval $PERLINVOKE
fi

exit
#perl -ne 'if($_ =~ s/\/na33.salesforce.com\//\/clarivateanalytics.my.salesforce.com\//g){print;}' one-per-line.csv > "$OUTNAME"