database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-03 20:02:46 +03:00
Code Activity

Enable standard_conforming_strings to be turned on.

Browse Source 
Kevin Grittner
This commit is contained in:
Bruce Momjian
2006-03-06 19:49:20 +00:00
parent a9c1047ebd
commit 19c21d115d
11 changed files with 294 additions and 112 deletions
Download Patch File Download Diff File Expand all files Collapse all files

100
src/backend/parser/scan.l
View File

@ -24,7 +24,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/scan.l,v 1.130 2006/03/05 15:58:34 momjian Exp $
* $PostgreSQL: pgsql/src/backend/parser/scan.l,v 1.131 2006/03/06 19:49:20 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -51,13 +51,14 @@ static int xcdepth = 0; /* depth of nesting in slash-star comments */
static char *dolqstart; /* current $foo$ quote start string */
/*
* GUC variable. This is a DIRECT violation of the warning given at the
* GUC variables. This is a DIRECT violation of the warning given at the
* head of gram.y, ie flex/bison code must not depend on any GUC variables;
* as such, changing its value can induce very unintuitive behavior.
* But we shall have to live with it as a short-term thing until the switch
* to SQL-standard string syntax is complete.
*/
bool escape_string_warning;
bool standard_conforming_strings;
static bool warn_on_first_escape;
@ -77,6 +78,7 @@ static void addlitchar(unsigned char ychar);
static char *litbufdup(void);
static int pg_err_position(void);
static void check_escape_warning(void);
static void check_string_escape_warning(unsigned char ychar);
/*
* When we parse a token that requires multiple lexer rules to process,
@ -119,7 +121,8 @@ static unsigned char unescape_single_char(unsigned char c);
* <xc> extended C-style comments
* <xd> delimited identifiers (double-quoted identifiers)
* <xh> hexadecimal numeric string
* <xq> quoted strings
* <xq> standard quoted strings
* <xe> extended quoted strings (support backslash escape sequences)
* <xdolq> $foo$ quoted strings
*/
@ -127,6 +130,7 @@ static unsigned char unescape_single_char(unsigned char c);
%x xc
%x xd
%x xh
%x xe
%x xq
%x xdolq
@ -200,6 +204,10 @@ xnstart [nN]{quote}
/* Quoted string that allows backslash escapes */
xestart [eE]{quote}
xeinside [^\\']+
xeescape [\\][^0-7]
xeoctesc [\\][0-7]{1,3}
xehexesc [\\]x[0-9A-Fa-f]{1,2}
/* Extended quote
* xqdouble implements embedded quote, ''''
@ -207,9 +215,7 @@ xestart [eE]{quote}
xqstart {quote}
xqdouble {quote}{quote}
xqinside [^\\']+
xqescape [\\][^0-7]
xqoctesc [\\][0-7]{1,3}
xqhexesc [\\]x[0-9A-Fa-f]{1,2}
xqbackslash [\\]
/* $foo$ style quotes ("dollar quoting")
* The quoted string starts with $foo$ where "foo" is an optional string
@ -428,73 +434,62 @@ other .
{xqstart} {
warn_on_first_escape = true;
token_start = yytext;
BEGIN(xq);
if (standard_conforming_strings)
BEGIN(xq);
else
BEGIN(xe);
startlit();
}
{xestart} {
warn_on_first_escape = false;
token_start = yytext;
BEGIN(xq);
BEGIN(xe);
startlit();
}
<xq>{quotestop} |
<xq>{quotefail} {
<xq,xe>{quotestop} |
<xq,xe>{quotefail} {
yyless(1);
BEGIN(INITIAL);
yylval.str = litbufdup();
return SCONST;
}
<xq>{xqdouble} {
<xq,xe>{xqdouble} {
addlitchar('\'');
}
<xq>{xqinside} {
addlit(yytext, yyleng);
}
<xq>{xqescape} {
if (yytext[1] == '\'')
{
if (warn_on_first_escape && escape_string_warning)
ereport(WARNING,
(errcode(ERRCODE_NONSTANDARD_USE_OF_ESCAPE_CHARACTER),
errmsg("nonstandard use of \\' in a string literal"),
errhint("Use '' to write quotes in strings, or use the escape string syntax (E'...')."),
errposition(pg_err_position())));
warn_on_first_escape = false; /* warn only once per string */
}
else if (yytext[1] == '\\')
{
if (warn_on_first_escape && escape_string_warning)
ereport(WARNING,
(errcode(ERRCODE_NONSTANDARD_USE_OF_ESCAPE_CHARACTER),
errmsg("nonstandard use of \\\\ in a string literal"),
errhint("Use the escape string syntax for backslashes, e.g., E'\\\\'."),
errposition(pg_err_position())));
warn_on_first_escape = false; /* warn only once per string */
}
else
check_escape_warning();
<xe>{xeinside} {
addlit(yytext, yyleng);
}
<xq>{xqbackslash} {
check_string_escape_warning(yytext[1]);
addlitchar('\\');
}
<xe>{xeescape} {
check_string_escape_warning(yytext[1]);
addlitchar(unescape_single_char(yytext[1]));
}
<xq>{xqoctesc} {
<xe>{xeoctesc} {
unsigned char c = strtoul(yytext+1, NULL, 8);
check_escape_warning();
addlitchar(c);
}
<xq>{xqhexesc} {
<xe>{xehexesc} {
unsigned char c = strtoul(yytext+2, NULL, 16);
check_escape_warning();
addlitchar(c);
}
<xq>{quotecontinue} {
<xq,xe>{quotecontinue} {
/* ignore */
}
<xq>. {
<xe>. {
/* This is only needed for \ just before EOF */
addlitchar(yytext[0]);
}
<xq><<EOF>> { yyerror("unterminated quoted string"); }
<xq,xe><<EOF>> { yyerror("unterminated quoted string"); }
{dolqdelim} {
token_start = yytext;
@ -875,6 +870,33 @@ unescape_single_char(unsigned char c)
}
}
static void
check_string_escape_warning(unsigned char ychar)
{
if (ychar == '\'')
{
if (warn_on_first_escape && escape_string_warning)
ereport(WARNING,
(errcode(ERRCODE_NONSTANDARD_USE_OF_ESCAPE_CHARACTER),
errmsg("nonstandard use of \\' in a string literal"),
errhint("Use '' to write quotes in strings, or use the escape string syntax (E'...')."),
errposition(pg_err_position())));
warn_on_first_escape = false; /* warn only once per string */
}
else if (ychar == '\\')
{
if (warn_on_first_escape && escape_string_warning)
ereport(WARNING,
(errcode(ERRCODE_NONSTANDARD_USE_OF_ESCAPE_CHARACTER),
errmsg("nonstandard use of \\\\ in a string literal"),
errhint("Use the escape string syntax for backslashes, e.g., E'\\\\'."),
errposition(pg_err_position())));
warn_on_first_escape = false; /* warn only once per string */
}
else
check_escape_warning();
}
static void
check_escape_warning(void)
{

7
src/backend/utils/misc/guc.c
View File

@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.312 2006/03/05 15:58:49 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.313 2006/03/06 19:49:20 momjian Exp $
*
*--------------------------------------------------------------------
*/
@ -224,7 +224,6 @@ static int max_index_keys;
static int max_identifier_length;
static int block_size;
static bool integer_datetimes;
static bool standard_conforming_strings;
/* should be static, but commands/variable.c needs to get at these */
char *role_string;
@ -974,10 +973,10 @@ static struct config_bool ConfigureNamesBool[] =
},
{
{"standard_conforming_strings", PGC_INTERNAL, PRESET_OPTIONS,
{"standard_conforming_strings", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
gettext_noop("'...' strings treat backslashes literally."),
NULL,
GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
GUC_REPORT
},
&standard_conforming_strings,
false, NULL, NULL

3
src/backend/utils/misc/postgresql.conf.sample
View File

@ -415,7 +415,8 @@
#add_missing_from = off
#array_nulls = on
#default_with_oids = off
#escape_string_warning = off
#escape_string_warning = off # warn about backslashes in string literals
#standard_conforming_strings = off # SQL standard string literal processing
#regex_flavor = advanced # advanced, extended, or basic
#sql_inheritance = on

25
src/bin/psql/common.c
View File

@ -3,7 +3,7 @@
*
* Copyright (c) 2000-2006, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/bin/psql/common.c,v 1.114 2006/03/05 15:58:51 momjian Exp $
* $PostgreSQL: pgsql/src/bin/psql/common.c,v 1.115 2006/03/06 19:49:20 momjian Exp $
*/
#include "postgres_fe.h"
#include "common.h"
@ -1328,6 +1328,29 @@ is_superuser(void)
}
/*
* Test if the current session uses standard string literals.
*
* Note: this will correctly detect the setting only with a protocol-3.0
* or newer backend; otherwise it will always say "false".
*/
bool
standard_strings(void)
{
const char *val;
if (!pset.db)
return false;
val = PQparameterStatus(pset.db, "standard_conforming_strings");
if (val && strcmp(val, "on") == 0)
return true;
return false;
}
/*
* Return the session user of the current connection.
*

3
src/bin/psql/common.h
View File

@ -3,7 +3,7 @@
*
* Copyright (c) 2000-2006, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/bin/psql/common.h,v 1.46 2006/03/05 15:58:51 momjian Exp $
* $PostgreSQL: pgsql/src/bin/psql/common.h,v 1.47 2006/03/06 19:49:20 momjian Exp $
*/
#ifndef COMMON_H
#define COMMON_H
@ -57,6 +57,7 @@ extern PGresult *PSQLexec(const char *query, bool start_xact);
extern bool SendQuery(const char *query);
extern bool is_superuser(void);
extern bool standard_strings(void);
extern const char *session_username(void);
extern char *expand_tilde(char **filename);

49
src/bin/psql/psqlscan.l
View File

@ -33,7 +33,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/bin/psql/psqlscan.l,v 1.16 2006/03/05 15:58:52 momjian Exp $
* $PostgreSQL: pgsql/src/bin/psql/psqlscan.l,v 1.17 2006/03/06 19:49:20 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -154,7 +154,8 @@ static void emit(const char *txt, int len);
* <xc> extended C-style comments
* <xd> delimited identifiers (double-quoted identifiers)
* <xh> hexadecimal numeric string
* <xq> quoted strings
* <xq> standard quoted strings
* <xe> extended quoted strings (support backslash escape sequences)
* <xdolq> $foo$ quoted strings
*/
@ -162,6 +163,7 @@ static void emit(const char *txt, int len);
%x xc
%x xd
%x xh
%x xe
%x xq
%x xdolq
/* Additional exclusive states for psql only: lex backslash commands */
@ -244,16 +246,17 @@ xnstart [nN]{quote}
/* Quoted string that allows backslash escapes */
xestart [eE]{quote}
xeinside [^\\']+
xeescape [\\][^0-7]
xeoctesc [\\][0-7]{1,3}
xehexesc [\\]x[0-9A-Fa-f]{1,2}
/* Extended quote
* xqdouble implements embedded quote, ''''
*/
xqstart {quote}
xqdouble {quote}{quote}
xqinside [^\\']+
xqescape [\\][^0-7]
xqoctesc [\\][0-7]{1,3}
xqhexesc [\\]x[0-9A-Fa-f]{1,2}
xqinside [^']+
/* $foo$ style quotes ("dollar quoting")
* The quoted string starts with $foo$ where "foo" is an optional string
@ -448,38 +451,44 @@ other .
}
{xqstart} {
BEGIN(xq);
if (standard_strings())
BEGIN(xq);
else
BEGIN(xe);
ECHO;
}
{xestart} {
BEGIN(xq);
BEGIN(xe);
ECHO;
}
<xq>{quotestop} |
<xq>{quotefail} {
<xq,xe>{quotestop} |
<xq,xe>{quotefail} {
yyless(1);
BEGIN(INITIAL);
ECHO;
}
<xq>{xqdouble} {
<xq,xe>{xqdouble} {
ECHO;
}
<xq>{xqinside} {
ECHO;
}
<xq>{xqescape} {
<xe>{xeinside} {
ECHO;
}
<xq>{xqoctesc} {
<xe>{xeescape} {
ECHO;
}
<xq>{xqhexesc} {
<xe>{xeoctesc} {
ECHO;
}
<xq>{quotecontinue} {
<xe>{xehexesc} {
ECHO;
}
<xq>. {
<xq,xe>{quotecontinue} {
ECHO;
}
<xe>. {
/* This is only needed for \ just before EOF */
ECHO;
}
@ -858,13 +867,13 @@ other .
"\\r" { appendPQExpBufferChar(output_buf, '\r'); }
"\\f" { appendPQExpBufferChar(output_buf, '\f'); }
{xqoctesc} {
{xeoctesc} {
/* octal case */
appendPQExpBufferChar(output_buf,
(char) strtol(yytext + 1, NULL, 8));
}
{xqhexesc} {
{xehexesc} {
/* hex case */
appendPQExpBufferChar(output_buf,
(char) strtol(yytext + 2, NULL, 16));
@ -1128,6 +1137,10 @@ psql_scan(PsqlScanState state,
result = PSCAN_INCOMPLETE;
*prompt = PROMPT_SINGLEQUOTE;
break;
case xe:
result = PSCAN_INCOMPLETE;
*prompt = PROMPT_SINGLEQUOTE;
break;
case xdolq:
result = PSCAN_INCOMPLETE;
*prompt = PROMPT_DOLLARQUOTE;

3
src/include/utils/guc.h
View File

@ -7,7 +7,7 @@
* Copyright (c) 2000-2006, PostgreSQL Global Development Group
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* $PostgreSQL: pgsql/src/include/utils/guc.h,v 1.65 2006/03/06 18:38:11 momjian Exp $
* $PostgreSQL: pgsql/src/include/utils/guc.h,v 1.66 2006/03/06 19:49:20 momjian Exp $
*--------------------------------------------------------------------
*/
#ifndef GUC_H
@ -121,6 +121,7 @@ extern bool Australian_timezones;
extern bool default_with_oids;
extern bool escape_string_warning;
extern bool standard_conforming_strings;
extern int log_min_error_statement;
extern int log_min_messages;

47
src/interfaces/ecpg/preproc/pgc.l
View File

@ -12,7 +12,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/pgc.l,v 1.144 2006/03/05 15:59:08 momjian Exp $
* $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/pgc.l,v 1.145 2006/03/06 19:49:20 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -30,7 +30,8 @@ extern YYSTYPE yylval;
static int xcdepth = 0; /* depth of nesting in slash-star comments */
static char *dolqstart; /* current $foo$ quote start string */
bool escape_string_warning;
static bool warn_on_first_escape;
bool standard_conforming_strings;
static bool warn_on_first_escape;
/*
* literalbuf is used to accumulate literal values when multiple rules
@ -96,7 +97,8 @@ static struct _if_value
* <xc> extended C-style comments - thomas 1997-07-12
* <xd> delimited identifiers (double-quoted identifiers) - thomas 1997-10-27
* <xh> hexadecimal numeric string - thomas 1997-11-16
* <xq> quoted strings - thomas 1997-07-30
* <xq> standard quoted strings - thomas 1997-07-30
* <xe> extended quoted strings (support backslash escape sequences)
* <xdolq> $foo$ quoted strings
*/
@ -105,6 +107,7 @@ static struct _if_value
%x xd
%x xdc
%x xh
%x xe
%x xq
%x xdolq
%x xpre
@ -125,6 +128,10 @@ xnstart [nN]{quote}
/* Quoted string that allows backslash escapes */
xestart [eE]{quote}
xeinside [^\\']+
xeescape [\\][^0-7]
xeoctesc [\\][0-7]{1,3}
xehexesc [\\]x[0-9A-Fa-f]{1,2}
/* C version of hex number */
xch 0[xX][0-9A-Fa-f]*
@ -135,9 +142,7 @@ xch 0[xX][0-9A-Fa-f]*
xqstart {quote}
xqdouble {quote}{quote}
xqinside [^\\']+
xqescape [\\][^0-7]
xqoctesc [\\][0-7]{1,3}
xqhexesc [\\]x[0-9A-Fa-f]{1,2}
xqbackslash [\\]
/* $foo$ style quotes ("dollar quoting")
* The quoted string starts with $foo$ where "foo" is an optional string
@ -405,43 +410,51 @@ cppline {space}*#(.*\\{space})*.*{newline}
warn_on_first_escape = true;
token_start = yytext;
state_before = YYSTATE;
BEGIN(xq);
if (standard_conforming_strings)
BEGIN(xq);
else
BEGIN(xe);
startlit();
}
<C,SQL>{xestart} {
warn_on_first_escape = false;
token_start = yytext;
state_before = YYSTATE;
BEGIN(xq);
BEGIN(xe);
startlit();
}
<xq>{quotestop} |
<xq>{quotefail} {
<xq,xe>{quotestop} |
<xq,xe>{quotefail} {
yyless(1);
BEGIN(state_before);
yylval.str = mm_strdup(literalbuf);
return SCONST;
}
<xq>{xqdouble} { addlitchar('\''); }
<xq,xe>{xqdouble} { addlitchar('\''); }
<xq>{xqinside} { addlit(yytext, yyleng); }
<xq>{xqescape} {
<xe>{xeinside} { addlit(yytext, yyleng); }
<xq>{xqbackslash} {
check_escape_warning();
addlitchar('\\');
}
<xe>{xeescape} {
check_escape_warning();
addlit(yytext, yyleng);
}
<xq>{xqoctesc} {
<xe>{xeoctesc} {
check_escape_warning();
addlit(yytext, yyleng);
}
<xq>{xqhexesc} {
<xe>{xehexesc} {
check_escape_warning();
addlit(yytext, yyleng);
}
<xq>{quotecontinue} { /* ignore */ }
<xq>{other} {
<xq,xe>{quotecontinue} { /* ignore */ }
<xe>. {
/* This is only needed for \ just before EOF */
addlitchar(yytext[0]);
}
<xq><<EOF>> { mmerror(PARSE_ERROR, ET_FATAL, "Unterminated quoted string"); }
<xq,xe><<EOF>> { mmerror(PARSE_ERROR, ET_FATAL, "Unterminated quoted string"); }
<SQL>{dolqfailed} {
/* throw back all but the initial "$" */
yyless(1);

87
src/test/regress/expected/strings.out
View File

@ -193,13 +193,13 @@ SELECT SUBSTRING('abcdefg' FROM 'b(.*)f') AS "cde";
(1 row)
-- PostgreSQL extension to allow using back reference in replace string;
SELECT regexp_replace('1112223333', '(\\d{3})(\\d{3})(\\d{4})', '(\\1) \\2-\\3');
SELECT regexp_replace('1112223333', E'(\\d{3})(\\d{3})(\\d{4})', E'(\\1) \\2-\\3');
regexp_replace
----------------
(111) 222-3333
(1 row)
SELECT regexp_replace('AAA BBB CCC ', '\\s+', ' ', 'g');
SELECT regexp_replace('AAA BBB CCC ', E'\\s+', ' ', 'g');
regexp_replace
----------------
AAA BBB CCC
@ -895,3 +895,86 @@ select md5('12345678901234567890123456789012345678901234567890123456789012345678
t
(1 row)
--
-- test behavior of escape_string_warning and standard_conforming_strings options
--
set escape_string_warning = off;
set standard_conforming_strings = off;
show escape_string_warning;
escape_string_warning
-----------------------
off
(1 row)
show standard_conforming_strings;
standard_conforming_strings
-----------------------------
off
(1 row)
set escape_string_warning = on;
set standard_conforming_strings = on;
show escape_string_warning;
escape_string_warning
-----------------------
on
(1 row)
show standard_conforming_strings;
standard_conforming_strings
-----------------------------
on
(1 row)
select 'a\bcd' as f1, 'a\b''cd' as f2, 'a\b''''cd' as f3, 'abcd\' as f4, 'ab\''cd' as f5, '\\' as f6;
WARNING: nonstandard use of escape in a string literal at character 8
HINT: Use the escape string syntax for escapes, e.g., E'\r\n'.
WARNING: nonstandard use of escape in a string literal at character 23
HINT: Use the escape string syntax for escapes, e.g., E'\r\n'.
WARNING: nonstandard use of escape in a string literal at character 40
HINT: Use the escape string syntax for escapes, e.g., E'\r\n'.
WARNING: nonstandard use of escape in a string literal at character 59
HINT: Use the escape string syntax for escapes, e.g., E'\r\n'.
WARNING: nonstandard use of escape in a string literal at character 76
HINT: Use the escape string syntax for escapes, e.g., E'\r\n'.
WARNING: nonstandard use of escape in a string literal at character 93
HINT: Use the escape string syntax for escapes, e.g., E'\r\n'.
f1 | f2 | f3 | f4 | f5 | f6
-------+--------+---------+-------+--------+----
a\bcd | a\b'cd | a\b''cd | abcd\ | ab\'cd | \\
(1 row)
set standard_conforming_strings = off;
select 'a\\bcd' as f1, 'a\\b\'cd' as f2, 'a\\b\'''cd' as f3, 'abcd\\' as f4, 'ab\\\'cd' as f5, '\\\\' as f6;
WARNING: nonstandard use of \\ in a string literal at character 8
HINT: Use the escape string syntax for backslashes, e.g., E'\\'.
WARNING: nonstandard use of \\ in a string literal at character 24
HINT: Use the escape string syntax for backslashes, e.g., E'\\'.
WARNING: nonstandard use of \\ in a string literal at character 42
HINT: Use the escape string syntax for backslashes, e.g., E'\\'.
WARNING: nonstandard use of \\ in a string literal at character 62
HINT: Use the escape string syntax for backslashes, e.g., E'\\'.
WARNING: nonstandard use of \\ in a string literal at character 80
HINT: Use the escape string syntax for backslashes, e.g., E'\\'.
WARNING: nonstandard use of \\ in a string literal at character 98
HINT: Use the escape string syntax for backslashes, e.g., E'\\'.
f1 | f2 | f3 | f4 | f5 | f6
-------+--------+---------+-------+--------+----
a\bcd | a\b'cd | a\b''cd | abcd\ | ab\'cd | \\
(1 row)
set escape_string_warning = off;
set standard_conforming_strings = on;
select 'a\bcd' as f1, 'a\b''cd' as f2, 'a\b''''cd' as f3, 'abcd\' as f4, 'ab\''cd' as f5, '\\' as f6;
f1 | f2 | f3 | f4 | f5 | f6
-------+--------+---------+-------+--------+----
a\bcd | a\b'cd | a\b''cd | abcd\ | ab\'cd | \\
(1 row)
set standard_conforming_strings = off;
select 'a\\bcd' as f1, 'a\\b\'cd' as f2, 'a\\b\'''cd' as f3, 'abcd\\' as f4, 'ab\\\'cd' as f5, '\\\\' as f6;
f1 | f2 | f3 | f4 | f5 | f6
-------+--------+---------+-------+--------+----
a\bcd | a\b'cd | a\b''cd | abcd\ | ab\'cd | \\
(1 row)

34
src/test/regress/sql/strings.sql
View File

@ -81,8 +81,8 @@ SELECT SUBSTRING('abcdefg' FROM 'c.e') AS "cde";
SELECT SUBSTRING('abcdefg' FROM 'b(.*)f') AS "cde";
-- PostgreSQL extension to allow using back reference in replace string;
SELECT regexp_replace('1112223333', '(\\d{3})(\\d{3})(\\d{4})', '(\\1) \\2-\\3');
SELECT regexp_replace('AAA BBB CCC ', '\\s+', ' ', 'g');
SELECT regexp_replace('1112223333', E'(\\d{3})(\\d{3})(\\d{4})', E'(\\1) \\2-\\3');
SELECT regexp_replace('AAA BBB CCC ', E'\\s+', ' ', 'g');
SELECT regexp_replace('AAA', '^|$', 'Z', 'g');
SELECT regexp_replace('AAA aaa', 'A+', 'Z', 'gi');
-- invalid option of REGEXP_REPLACE
@ -352,3 +352,33 @@ select md5('abcdefghijklmnopqrstuvwxyz'::bytea) = 'c3fcd3d76192e4007dfb496cca67e
select md5('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'::bytea) = 'd174ab98d277d9f5a5611c2c9f419d9f' AS "TRUE";
select md5('12345678901234567890123456789012345678901234567890123456789012345678901234567890'::bytea) = '57edf4a22be3c955ac49da2e2107b67a' AS "TRUE";
--
-- test behavior of escape_string_warning and standard_conforming_strings options
--
set escape_string_warning = off;
set standard_conforming_strings = off;
show escape_string_warning;
show standard_conforming_strings;
set escape_string_warning = on;
set standard_conforming_strings = on;
show escape_string_warning;
show standard_conforming_strings;
select 'a\bcd' as f1, 'a\b''cd' as f2, 'a\b''''cd' as f3, 'abcd\' as f4, 'ab\''cd' as f5, '\\' as f6;
set standard_conforming_strings = off;
select 'a\\bcd' as f1, 'a\\b\'cd' as f2, 'a\\b\'''cd' as f3, 'abcd\\' as f4, 'ab\\\'cd' as f5, '\\\\' as f6;
set escape_string_warning = off;
set standard_conforming_strings = on;
select 'a\bcd' as f1, 'a\b''cd' as f2, 'a\b''''cd' as f3, 'abcd\' as f4, 'ab\''cd' as f5, '\\' as f6;
set standard_conforming_strings = off;
select 'a\\bcd' as f1, 'a\\b\'cd' as f2, 'a\\b\'''cd' as f3, 'abcd\\' as f4, 'ab\\\'cd' as f5, '\\\\' as f6;