Re: Question on replace function [solved]

On 09/25/2016 08:39 AM, Tom Lane wrote:
> Charles Clavadetscher <clavadetscher@swisspug.org> writes:
>> Honestly I still don't understand why this happened this way.
>
> I wonder if you have standard_conforming_strings turned off, or
> did when that data was inserted.  That would change the behavior
> of backslashes in string literals.

That got me to thinking:

standard_conforming_strings = on

test=# create table test (txt text);
CREATE TABLE

test=# insert into test values ('BEGIN:VCARD\r\\rVERSION:3.0\r\\rN:Halbritter;Ursula;;;\r\\rFN:Ursula
Halbritter\r\\rEMAIL;TYPE=INTERNET;TYPE=HOME:ursula.halbritter@zweiernet.ch\r\\rADR;TYPE=home:;;strasse;schwerzenbach;;;ooooooooooooooooooooooooooo\r\\rEND:VCARD');

INSERT 0 1

test=# insert into test values (E'BEGIN:VCARD\r\\rVERSION:3.0\r\\rN:Halbritter;Ursula;;;\r\\rFN:Ursula
Halbritter\r\\rEMAIL;TYPE=INTERNET;TYPE=HOME:ursula.halbritter@zweiernet.ch\r\\rADR;TYPE=home:;;strasse;schwerzenbach;;;ooooooooooooooooooooooooooo\r\\rEND:VCARD');

INSERT 0 1

test=# \copy test to test.txt
COPY 2

cat test.txt

BEGIN:VCARD\\r\\\\rVERSION:3.0\\r\\\\rN:Halbritter;Ursula;;;\\r\\\\rFN:Ursula
Halbritter\\r\\\\rEMAIL;TYPE=INTERNET;TYPE=HOME:ursula.halbritter@zweiernet.ch\\r\\\\rADR;TYPE=home:;;strasse;schwerzenbach;;;ooooooooooooooooooooooooooo\\r\\\\rEND:VCARD
BEGIN:VCARD\r\\rVERSION:3.0\r\\rN:Halbritter;Ursula;;;\r\\rFN:Ursula
Halbritter\r\\rEMAIL;TYPE=INTERNET;TYPE=HOME:ursula.halbritter@zweiernet.ch\r\\rADR;TYPE=home:;;strasse;schwerzenbach;;;ooooooooooooooooooooooooooo\r\\rEND:VCARD


standard_conforming_strings = off

test=# truncate test;
TRUNCATE TABLE

test=# insert into test values ('BEGIN:VCARD\r\\rVERSION:3.0\r\\rN:Halbritter;Ursula;;;\r\\rFN:Ursula
Halbritter\r\\rEMAIL;TYPE=INTERNET;TYPE=HOME:ursula.halbritter@zweiernet.ch\r\\rADR;TYPE=home:;;strasse;schwerzenbach;;;ooooooooooooooooooooooooooo\r\\rEND:VCARD');

WARNING:  nonstandard use of escape in a string literal
LINE 1: insert into test values ('BEGIN:VCARD\r\\rVERSION:3.0\r\\rN:...
                                 ^
HINT:  Use the escape string syntax for escapes, e.g., E'\r\n'.
INSERT 0 1

test=# insert into test values (E'BEGIN:VCARD\r\\rVERSION:3.0\r\\rN:Halbritter;Ursula;;;\r\\rFN:Ursula
Halbritter\r\\rEMAIL;TYPE=INTERNET;TYPE=HOME:ursula.halbritter@zweiernet.ch\r\\rADR;TYPE=home:;;strasse;schwerzenbach;;;ooooooooooooooooooooooooooo\r\\rEND:VCARD');

INSERT 0 1

test=# \copy test to test_off.txt
COPY 2

cat test_off.txt

BEGIN:VCARD\r\\rVERSION:3.0\r\\rN:Halbritter;Ursula;;;\r\\rFN:Ursula
Halbritter\r\\rEMAIL;TYPE=INTERNET;TYPE=HOME:ursula.halbritter@zweiernet.ch\r\\rADR;TYPE=home:;;strasse;schwerzenbach;;;ooooooooooooooooooooooooooo\r\\rEND:VCARD
BEGIN:VCARD\r\\rVERSION:3.0\r\\rN:Halbritter;Ursula;;;\r\\rFN:Ursula
Halbritter\r\\rEMAIL;TYPE=INTERNET;TYPE=HOME:ursula.halbritter@zweiernet.ch\r\\rADR;TYPE=home:;;strasse;schwerzenbach;;;ooooooooooooooooooooooooooo\r\\rEND:VCARD



>
>             regards, tom lane
>
>


--
Adrian Klaver
adrian.klaver@aklaver.com