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Full Discussion: Replace double quotes with a single quote within a double quoted string
Top Forums Shell Programming and Scripting Replace double quotes with a single quote within a double quoted string Post 302899995 by bakunin on Friday 2nd of May 2014 05:25:11 PM
Old 05-02-2014
Quote:
Originally Posted by pchang
I hope I can be clear on my explanation.

We are basically receiving a csv file from the vendor and any field they deemed as text, they will enclose with a double quote.

The problem arises when they also have/use a double quote as part of the data.
OK. The following may not be a perfect solution (coming from a less-than-rock-solid definition), but check how far you get with it.

Let us say that quotes you want to preserve are the ones immediately preceeding or following commas (which seem to be the field separators here). In addition there is a single double-quote at the beginning of the line and one at the end of the line. All the other double quotes should become single quotes.

This would work for your example, but there are cases conceivable where this ruleset could be tricked. This is why i suggest you doubly check if it works on your data or if we need to make the ruleset more solid.

Solution: first, all the sequences of "," are replaced by a placeholder (i use "@@", change it to something else if this is used in your data). Also the double-quotes at BOL and EOL are replaced. Then i change the remaining double-quotes to single-quotes and finally transfer the placeholders back.

This sounds complicated, but it makes the regexps necessary a lot easier to handle (and to understand).

Code:
sed "s/^\"/@@/;s/\"$/@@/;s/\",\"/@@/g;s/\",/@@@/g;s/,\"/@@@@/g
     s/\"/\'/g
     s/^@@/\"/;s/@@$/\"/;s/@@@@/,\"/g;s/@@@/\",/g;s/@@/\",\"/g" /path/to/input

I hope this helps.

bakunin
 

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LEARN ABOUT DEBIAN

perl::critic::policy::valuesandexpressions::prohibitquotesasquot

Perl::Critic::Policy::ValuesAndExpressions::ProhibitQuPerl::Critic::Policy::ValuesAndExpressions::ProhibitQuotesAsQuotelikeOperatorDelimiters(3pm)

NAME

       Perl::Critic::Policy::ValuesAndExpressions::ProhibitQuotesAsQuotelikeOperatorDelimiters - Don't use quotes ("'", """, "`") as delimiters
       for the quote-like operators.

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       With the obvious exception of using single-quotes to prevent interpolation, using quotes with the quote-like operators kind of defeats the
       purpose of them and produces obfuscated code, causing problems for future maintainers and their editors/IDEs.

	   $x = q"q";		     #not ok
	   $x = q'q';		     #not ok
	   $x = q`q`;		     #not ok

	   $x = qq"q";		     #not ok
	   $x = qr"r";		     #not ok
	   $x = qw"w";		     #not ok

	   $x = qx`date`;	     #not ok

	   $x =~ m"m";		     #not ok
	   $x =~ s"s"x";	     #not ok
	   $x =~ tr"t"r";	     #not ok
	   $x =~ y"x"y";	     #not ok

	   $x =~ m'$x'; 	     #ok
	   $x =~ s'$x'y';	     #ok
	   $x = qr'$x'm;	     #ok
	   $x = qx'finger foo@bar';  #ok

CONFIGURATION

       This policy has three options: "single_quote_allowed_operators", "double_quote_allowed_operators", and "back_quote_allowed_operators",
       which control which operators are allowed to use each of "'", """, "`" as delimiters, respectively.

       The values allowed for these options are a whitespace delimited selection of the "m", "q", "qq", "qr", "qw", "qx", "s", "tr", and "y"
       operators.

       By default, double quotes and back quotes (backticks) are not allowed as delimiters for any operators and single quotes are allowed as
       delimiters for the "m", "qr", "qx", and "s" operators.  These defaults are equivalent to having the following in your .perlcriticrc:

	   [ValuesAndExpressions::ProhibitQuotesAsQuotelikeOperatorDelimiters]
	   single_quote_allowed_operators = m s qr qx
	   double_quote_allowed_operators =
	   back_quote_allowed_operators =

SUGGESTED BY

       Michael Schwern

AUTHOR

       Elliot Shank "<perl@galumph.com>"

COPYRIGHT

       Copyright (c) 2007-2011 Elliot Shank.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  The full text of this license
       can be found in the LICENSE file included with this module.

perl v5.14.2					      Perl::Critic::Policy::ValuesAndExpressions::ProhibitQuotesAsQuotelikeOperatorDelimiters(3pm)
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