Problem with sscanf

[Tim Streater]

I'm obviously missing something here. I have a line like this (in
$line), and I want all the text within the double quotes::

somestr="string I want"

with some whitespace at the beginning. So I try this:

$res = sscanf ($line, ' %s"%s"');
$wanted = $res[1];

This appears to put the whole string in $res[0] (possibly minus the
whitespace). What am I doing wrong?

TIA - tim

[Olaf Schinkel]

Tim Streater schrieb:

I'm obviously missing something here. I have a line like this (in
$line), and I want all the text within the double quotes::

somestr="string I want"

with some whitespace at the beginning. So I try this:

$res = sscanf ($line, ' %s"%s"');
$wanted = $res[1];

This appears to put the whole string in $res[0] (possibly minus the
whitespace). What am I doing wrong?

TIA - tim

You are looking for:
preg_match_all();

[=?ISO-8859-1?Q?=22=C1lvaro_G=2E_Vicario=22?=]

Tim Streater escribió:

$res = sscanf ($line, ' %s"%s"');
$wanted = $res[1];

This appears to put the whole string in $res[0] (possibly minus the
whitespace). What am I doing wrong?

Well, that depends on what $line looks like. Can we see it?
--
-- http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
-- Mi sitio sobre programación web: http://bits.demogracia.com
-- Mi web de humor al baño María: http://www.demogracia.com
--

[Captain Paralytic]

On 24 Jun, 15:08, "Álvaro G. Vicario"
<[e-mail]:

Tim Streater escribió:

$res = sscanf ($line, ' %s"%s"');
$wanted = $res[1];

This appears to put the whole string in $res[0] (possibly minus the
whitespace). What am I doing wrong?

Well, that depends on what $line looks like. Can we see it?

He told you in the OP

[=?ISO-8859-1?Q?=22=C1lvaro_G=2E_Vicario=22?=]

Captain Paralytic escribió:

>>$res = sscanf ($line, ' %s"%s"');
$wanted = $res[1];
This appears to put the whole string in $res[0] (possibly minus the
whitespace). What am I doing wrong?

Well, that depends on what $line looks like. Can we see it?

He told you in the OP

I guess you're right; I was confused because I was expecting actual
code, not a description of it xD
--
-- http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
-- Mi sitio sobre programación web: http://bits.demogracia.com
-- Mi web de humor al baño María: http://www.demogracia.com
--

[Tim Streater]

In article
<e0**********************************@d1g2000hsg.g ooglegroups.com>,
Captain Paralytic <pa**********@yahoo.comwrote:

On 24 Jun, 15:08, "Álvaro G. Vicario"
<[e-mail]:

Tim Streater escribió:

$res = sscanf ($line, ' %s"%s"');
$wanted = $res[1];

This appears to put the whole string in $res[0] (possibly minus the
whitespace). What am I doing wrong?

Well, that depends on what $line looks like. Can we see it?

He told you in the OP

I since discover there may be a NULL at the end of the string. But I
wouldn't have expected that to matter.

Meanwhile I have used strtok to get the bit I want. It would be nice to
know what was going on, however.

[Tim Streater]

In article <g3**********@huron.algomas.org>,
"Álvaro G. Vicario" <al****************@demogracia.comwrote:

Captain Paralytic escribió:

>$res = sscanf ($line, ' %s"%s"');
$wanted = $res[1];
This appears to put the whole string in $res[0] (possibly minus the
whitespace). What am I doing wrong?
Well, that depends on what $line looks like. Can we see it?

He told you in the OP

I guess you're right; I was confused because I was expecting actual
code, not a description of it xD

That *was* actual code :-)

[=?ISO-8859-1?Q?=22=C1lvaro_G=2E_Vicario=22?=]

Tim Streater escribió:

somestr="string I want"

with some whitespace at the beginning. So I try this:

$res = sscanf ($line, ' %s"%s"');

I'd say that sscanf() performs a greedy match so the first %s receives
as much as it cans, given that it fits into the description of "string"
(e.g., everything) and there's nothing left for the second %s.

It's time you get to know regular expressions. An untested hint:

if( preg_match('/^\s+(\S+)"(.*)"$/iU', $line, $matches) ){
print_r( $matches );
}

P.S. I didn't even know there was scanf in PHP; its C variant is the
most useless function I learnt in my programming classes :)

--
-- http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
-- Mi sitio sobre programación web: http://bits.demogracia.com
-- Mi web de humor al baño María: http://www.demogracia.com
--

[Tim Streater]

In article <g3**********@huron.algomas.org>,
"Álvaro G. Vicario" <al****************@demogracia.comwrote:

Tim Streater escribió:

somestr="string I want"

with some whitespace at the beginning. So I try this:

$res = sscanf ($line, ' %s"%s"');

I'd say that sscanf() performs a greedy match so the first %s receives
as much as it cans, given that it fits into the description of "string"
(e.g., everything) and there's nothing left for the second %s.

That seems to be what it's doing even though that contradicts the
documentation. An example:

$line = "One two";
$res = sscanf ($line, "%s %s")
echo $res[0] // outputs "One"
echo $res[1] // outputs "Two"

This is similar to the examples in the on-line docs.

It's time you get to know regular expressions. An untested hint:

if( preg_match('/^\s+(\S+)"(.*)"$/iU', $line, $matches) ){
print_r( $matches );
}

I avoid regexps unless I am forced to by the function involved, and even
then keep it simple. Regexps are typically unreadable.

P.S. I didn't even know there was scanf in PHP; its C variant is the
most useless function I learnt in my programming classes :)

sscanf. I've used it to great effect in the past in C code, but that was
20 years ago. Perhaps the PHP version is broken.

[Curtis]

On Tue, 24 Jun 2008 07:51:42 -0700, Tim Streater
<ti**********@dante.org.ukwrote:

In article <g3**********@huron.algomas.org>,
"Álvaro G. Vicario" <al****************@demogracia.comwrote:

>Tim Streater escribió:

somestr="string I want"

with some whitespace at the beginning. So I try this:

$res = sscanf ($line, ' %s"%s"');

I'd say that sscanf() performs a greedy match so the first %s receives
as much as it cans, given that it fits into the description of "string"
(e.g., everything) and there's nothing left for the second %s.

That seems to be what it's doing even though that contradicts the
documentation. An example:

$line = "One two";
$res = sscanf ($line, "%s %s")
echo $res[0] // outputs "One"
echo $res[1] // outputs "Two"

This is similar to the examples in the on-line docs.

>It's time you get to know regular expressions. An untested hint:

if( preg_match('/^\s+(\S+)"(.*)"$/iU', $line, $matches) ){
print_r( $matches );
}

I avoid regexps unless I am forced to by the function involved, and even
then keep it simple. Regexps are typically unreadable.

That's good practice, but regexes need not be unreadable, that's what the
/x modifier is for.

>P.S. I didn't even know there was scanf in PHP; its C variant is the
most useless function I learnt in my programming classes :)

sscanf. I've used it to great effect in the past in C code, but that was
20 years ago. Perhaps the PHP version is broken.

I was messing around with sscanf, this seems to work, but you need to know
the exact whitespace at the beginning. I also had to assume that you used
foo="bar" exactly. If you need better matching, regex is your best bet,
it's not that much overhead, anyway.

sscanf($str, ' %[a-z0-9]="%[a-z0-9]"', $name, $value);

--
Curtis, http://dyersweb.com