Help with a regular expression

[YoBro]

Hi

I have used some of this code from the PHP manual, but I am bloody hopeless
with regular expressions.
Was hoping somebody could offer a hand.

The output of this will put the name of a form field beside name.
I want to get the following but not sure how to modify the code below.
1. Field Name (to appear beside NAME:)
2. Field Type (to appear beside TYPE:)
3. Field Value (to appear beside VALUE:)

Make sense.
It is part way there, just need some help finishing it.

$filename = "form-eg.php"; // Open file to read HTML with Form code
$fd = fopen ($filename, "rb");
$contents = fread ($fd, filesize ($filename));
preg_match_all ('/<input.*?name\\ s*=\\s*"?([^\\s>"]*)/i', $contents,
$matches); // get all input fields and attributes and values

for ($i=0; $i< count($matches[0]); $i++) {
echo "matched: ".$matches[0][$i]."<br />\n";
echo "NAME: ".$matches[1][$i]."<br />\n";
echo "TYPE: ".$matches[3][$i]."<br />\n";
echo "VALUE: ".$matches[4][$i]."<br />\n\n";
}

fclose ($fd);

I will also need to run another check for :
<select
<textarea

But I can probably figure that out from what I already have.

Thanks,

YoBro

[Pedro Graca]

Re: Help with a regular expression

YoBro wrote:[color=blue]
> I have used some of this code from the PHP manual, but I am bloody hopeless
> with regular expressions.[/color]

Although I've heard often enough that RXs are not the best tool for this
job (try a HTML or XML parser) I do very well with them myself :)
[color=blue]
> Was hoping somebody could offer a hand.
>
> The output of this will put the name of a form field beside name.
> I want to get the following but not sure how to modify the code below.
> 1. Field Name (to appear beside NAME:)
> 2. Field Type (to appear beside TYPE:)
> 3. Field Value (to appear beside VALUE:)[/color]

But I follow a different path than you.

<?php
// initialize result data
$html_input = array();
$html_index = 0;

// get HTML
$contents = file_get_conten ts('http://www.faqs.org/rfcs/index.html');

// get all "<input ... >"s -- usually I'd group them by <form>s too
preg_match_all( '@(<input[^>]+>)@Ui', $contents, $inputs);

// inside each "<input ... >" isolate the pairs "attr=value "
foreach ($inputs[1] as $input) {
// once for double quoted values
preg_match_all( '@(([^\s<>]+)\s*=\s*"([^"<>]+)")@', $input, $matches);
// save them
foreach ($matches[0] as $k=>$dummy) {
$html_inputs[$html_index][$matches[2][$k]] = $matches[3][$k];
}
++$html_index;

// once for single quoted values
preg_match_all( '@(([^\s<>]+)\s*=\s*\'([^\'<>]+)\')@', $input, $matches);
foreach ($matches[0] as $k=>$dummy) {
$html_inputs[$html_index][$matches[2][$k]] = $matches[3][$k];
}
++$html_index;

// and once again for unquoted values
preg_match_all( '@(([^\s<>]+)\s*=\s*([^\s<>"\']+))@', $input, $matches);
foreach ($matches[0] as $k=>$dummy) {
$html_inputs[$html_index][$matches[2][$k]] = $matches[3][$k];
}
++$html_index;
}

// done, deal with them anyway I like
echo '<pre>'; print_r($html_i nputs); echo '</pre>';
?>
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[John Dunlop]

Parsing (X)HTML with regular expressions, or not (was: Help with a regular expression)

Pedro Graca wrote:
[color=blue]
> Although I've heard often enough that RXs are not the best tool for this
> job (try a HTML or XML parser) I do very well with them myself :)[/color]

I believe the principal reason why pre-written parsers are suggested
and recommended instead of impromptu regular expression "one-liners"
is that the gurus who've written and developed the parsers are
usually aware of and understand the rules; the "one-line" regex
implementors, on the other hand -- with all due respect -- generally
aren't and don't. I'm not going to pretend I understand everything
SGML; I certainly don't; I'm far too young for starters.

I'd like to pass a few comments, nevertheless, which might change
your mind about regular expressions for parsing (X)HTML. They
changed my mind, anyway. You'll understand though, hopefully, why I
haven't offered any regular expression in place of yours (no, it's
not because I couldn't be bothered :-)).

(Trying to cope with shorthand markup when using regexes would be a
nightmare. Unlike proper parsers, I'm going to act like a browser
and ignore shorthand markup, for the time being, as it'd complicate
matters even more.)
[color=blue]
> // get all "<input ... >"s -- usually I'd group them by <form>s too
> preg_match_all( '@(<input[^>]+>)@Ui', $contents, $inputs);[/color]

There's the standard mistake: the next occurrence of ">" does not
necessarily mark the end of the tag. In HTML, a ">" can appear in
*quoted* attribute values; it cannot appear in unquoted attribute
values. This, for example, is a valid INPUT element (I make no
claims to its logicality!)

<INPUT title=">">

Also, INPUTs have no required attributes (that is, "<INPUT>" is
valid), but the "+" quantifier matches *one* or more of whatever came
before. To over-simplistically match INPUTs, I'd substitute "*" for
"+". Since you're only wanting to match those INPUTs with explicit
type, name and value attributes, however, that's inconsequential .
[color=blue]
> // inside each "<input ... >" isolate the pairs "attr=value "
> foreach ($inputs[1] as $input) {
> // once for double quoted values
> preg_match_all( '@(([^\s<>]+)\s*=\s*"([^"<>]+)")@', $input, $matches);[/color]

An SGML name begins with a name start character and is followed by
zero or more name characters. You'd match a name, for HTML4.01, with
the pattern

[a-zA-Z][a-zA-Z0-9.-_:]*

An attribute value may be of length zero, so, again, the quantifier
"*" ought to be used. And inside quoted attribute values, both "<"
and ">" can appear. Alvaro G Vicario has just pointed this out too,
in an article in the thread "php sticky forms",

<news:1qih21wt0 xy4e$.1f5ehf0s1 tf5a$.dlg@40tud e.net>.
[color=blue]
> // once for single quoted values
> preg_match_all( '@(([^\s<>]+)\s*=\s*\'([^\'<>]+)\')@', $input, $matches);[/color]

Ditto.
[color=blue]
> // and once again for unquoted values
> preg_match_all( '@(([^\s<>]+)\s*=\s*([^\s<>"\']+))@', $input, $matches);[/color]

Unquoted attribute values may only contain name characters. In
HTML4.01, the pattern

[a-zA-Z0-9.-_:]*

matches name characters.

Phew!

Refs.:

http://www.w3.org/TR/html401/sgml/sgmldecl.html

http://xml.coverpages.org/sgmlsyn/sgmlsyn.htm

--
Jock

[Pedro Graca]

Re: Parsing (X)HTML with regular expressions, or not (was: Help with a regular expression)

John Dunlop wrote:[color=blue]
> Pedro Graca wrote:
>[color=green]
>> Although I've heard often enough that RXs are not the best tool for this
>> job (try a HTML or XML parser) I do very well with them myself :)[/color][/color]
[color=blue]
> I'd like to pass a few comments, nevertheless, which might change
> your mind about regular expressions for parsing (X)HTML.[/color]

Appreciate it.
[color=blue]
> They changed my mind, anyway.[/color]

Changed my mind, too. Will take a little longer to change my scripts.
But new scripts will not use regular expressions!
[color=blue]
> You'll understand though, hopefully, why I
> haven't offered any regular expression in place of yours (no, it's
> not because I couldn't be bothered :-)).[/color]

Same reason I'm not changing them, I guess :-)
[color=blue]
> (Trying to cope with shorthand markup when using regexes would be a
> nightmare. Unlike proper parsers, I'm going to act like a browser
> and ignore shorthand markup, for the time being, as it'd complicate
> matters even more.)[/color]

Don't even mention that.

(snip very good content)
Thank you John. Thank you very much.
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[YoBro]

Re: Parsing (X)HTML with regular expressions, or not (was: Help with a regular expression)

Any idea of some real life working examples to do it the SGML way. Something
I have never heard of before.

The reference links appear to have no relevance to what I am trying to do.

There is a php function xml_parse, could this be used?
The documentation is light on that topic.

Thanks!

"Pedro Graca" <hexkid@hotpop. com> wrote in message
news:c2an23$1ra p4q$1@ID-203069.news.uni-berlin.de...[color=blue]
> John Dunlop wrote:[color=green]
> > Pedro Graca wrote:
> >[color=darkred]
> >> Although I've heard often enough that RXs are not the best tool for[/color][/color][/color]
this[color=blue][color=green][color=darkred]
> >> job (try a HTML or XML parser) I do very well with them myself :)[/color][/color]
>[color=green]
> > I'd like to pass a few comments, nevertheless, which might change
> > your mind about regular expressions for parsing (X)HTML.[/color]
>
> Appreciate it.
>[color=green]
> > They changed my mind, anyway.[/color]
>
> Changed my mind, too. Will take a little longer to change my scripts.
> But new scripts will not use regular expressions!
>[color=green]
> > You'll understand though, hopefully, why I
> > haven't offered any regular expression in place of yours (no, it's
> > not because I couldn't be bothered :-)).[/color]
>
> Same reason I'm not changing them, I guess :-)
>[color=green]
> > (Trying to cope with shorthand markup when using regexes would be a
> > nightmare. Unlike proper parsers, I'm going to act like a browser
> > and ignore shorthand markup, for the time being, as it'd complicate
> > matters even more.)[/color]
>
> Don't even mention that.
>
> (snip very good content)
> Thank you John. Thank you very much.
> --
> --= my mail box only accepts =--
> --= Content-Type: text/plain =--
> --= Size below 10001 bytes =--[/color]

[Pedro Graca]

Re: Parsing (X)HTML with regular expressions, or not (was: Help with a regular expression)

I (Pedro Graca) wrote:[color=blue]
> Changed my mind, too. Will take a little longer to change my scripts.
> But new scripts will not use regular expressions![/color]

Ufffffff. This took longer than I expected.

The XML parser included with PHP gives errors for many of the pages I
tested (most of them were HTML pages, so it's understandable :).

I found a parser for HTML I like @ http://php-html.sourceforge.net/

#v+
<?php
include 'htmlparser.inc .php'; // Yes! I changed the name
// also changed short php tag

$contents = file_get_conten ts('http://www.faqs.org/rfcs/index.html');

$parser = new HtmlParser($con tents);
while ($parser->parse()) {
if (strtolower($pa rser->iNodeName) == 'input') {

#echo "\niNodeTyp e: "; print_r($parser->iNodeType);
#echo "\niNodeNam e: "; print_r($parser->iNodeName);
#echo "\niNodeVal ue: "; print_r($parser->iNodeValue);
echo "\niNodeAttribu tes: "; print_r($parser->iNodeAttribute s);
}
}

echo "\n\nDone!\ n";
?>
#v-

and the result of this script is:

iNodeAttributes : Array
(
[name] => query
[size] => 25
)

iNodeAttributes : Array
(
[type] => submit
[value] => Search RFCs
)

iNodeAttributes : Array
(
[name] => display
[size] => 9
)

iNodeAttributes : Array
(
[type] => submit
[value] => Display RFC By Number
)


Done!
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[YoBro]

Re: Parsing (X)HTML with regular expressions, or not (was: Help with a regular expression)

Hi,

Thanks, that is very helpful.
I have tried to download this file but my browser keeps crashing when I get
there.

I don't suppose if you have a copy you could email it to me?
('htmlparser.in c.php')
to: yobro@wazzup.co .nz.

YoBro!




"Pedro Graca" <hexkid@hotpop. com> wrote in message
news:c2e627$1st v3d$1@ID-203069.news.uni-berlin.de...[color=blue]
> I (Pedro Graca) wrote:[color=green]
> > Changed my mind, too. Will take a little longer to change my scripts.
> > But new scripts will not use regular expressions![/color]
>
> Ufffffff. This took longer than I expected.
>
> The XML parser included with PHP gives errors for many of the pages I
> tested (most of them were HTML pages, so it's understandable :).
>
> I found a parser for HTML I like @ http://php-html.sourceforge.net/
>
> #v+
> <?php
> include 'htmlparser.inc .php'; // Yes! I changed the name
> // also changed short php tag
>
> $contents = file_get_conten ts('http://www.faqs.org/rfcs/index.html');
>
> $parser = new HtmlParser($con tents);
> while ($parser->parse()) {
> if (strtolower($pa rser->iNodeName) == 'input') {
>
> #echo "\niNodeTyp e: "; print_r($parser->iNodeType);
> #echo "\niNodeNam e: "; print_r($parser->iNodeName);
> #echo "\niNodeVal ue: "; print_r($parser->iNodeValue);
> echo "\niNodeAttribu tes: "; print_r($parser->iNodeAttribute s);
> }
> }
>
> echo "\n\nDone!\ n";
> ?>
> #v-
>
> and the result of this script is:
>
> iNodeAttributes : Array
> (
> [name] => query
> [size] => 25
> )
>
> iNodeAttributes : Array
> (
> [type] => submit
> [value] => Search RFCs
> )
>
> iNodeAttributes : Array
> (
> [name] => display
> [size] => 9
> )
>
> iNodeAttributes : Array
> (
> [type] => submit
> [value] => Display RFC By Number
> )
>
>
> Done!
> --
> --= my mail box only accepts =--
> --= Content-Type: text/plain =--
> --= Size below 10001 bytes =--[/color]

[Pedro Graca]

Re: Parsing (X)HTML with regular expressions, or not (was: Help with a regular expression)

YoBro top-posted:[color=blue]
> I have tried to download this file but my browser keeps crashing when I get
> there.
>
> I don't suppose if you have a copy you could email it to me?[/color]

Try here first :)

https://sourceforge.net/project/showfiles.php?group_id=91649

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