Regex to get the <html></html>
Regex to get the <html></html>
am 02.08.2007 17:48:24 von FFMG
Hi,
I want to get the
code and a 'simple?' solution seems to be
be...
preg_match_all("/<[html]+[^>]*>\s*(.*\s*)<\/html>\s*/i", $html,
$matches, PREG_SET_ORDER);
but I want to make sure that there isn't a better solution to the
problem especially if the head contains invalid code like...
//--
//--
unfortunately this is my html code so I cannot ignore invalid
like the one above.
So...
How can I change my regex to ignore head tags inside double or single
quotes?
How can I look for multiple line code inside the head.
Any suggestions?
FFMG
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Re: Regex to get the <html></html>
am 02.08.2007 18:33:00 von luiheidsgoeroe
On Thu, 02 Aug 2007 17:48:24 +0200, FFMG
m> =
wrote:
> I want to get the
code and a 'simple?' solution seems to be
> be...
>
> preg_match_all("/<[html]+[^>]*>\s*(.*\s*)<\/html>\s*/i", $html,
> $matches, PREG_SET_ORDER);
Euhm, nope. you start on an undefined tag (lose the blockquotes around =
'[html]'), and you;re matching the html tag, not the head tag.
> but I want to make sure that there isn't a better solution to the
> problem especially if the head contains invalid code like...
>
> //--
>
> " />
>
> //--
DOM functions?
> How can I change my regex to ignore head tags inside double or single
> quotes?
Could be done by setting a greedy match starting on a quote untill the =
endquote. Then again, if you're concerned with invalid attributes, you'd=
=
have to allow for the possibility the quotes are erronous too, i.e. =
someone forgot to open or close them.
I've taken a stab at it with regexes in the past, which works quite well=
=
as long as you can be sure it's stricly valid HTML. If it isn't, or you'=
re =
using outside sources where this isn't known, don't use regular =
expressions for something a parser ought to be doing.
-- =
Rik Wasmus
Re: Regex to get the <html></html>
am 02.08.2007 19:36:32 von gosha bine
FFMG wrote:
> Hi,
>
> I want to get the
code and a 'simple?' solution seems to be
> be...
>
> preg_match_all("/<[html]+[^>]*>\s*(.*\s*)<\/html>\s*/i", $html,
> $matches, PREG_SET_ORDER);
>
> but I want to make sure that there isn't a better solution to the
> problem especially if the head contains invalid code like...
>
> //--
>
>
>
> //--
>
> unfortunately this is my html code so I cannot ignore invalid
> like the one above.
>
> So...
> How can I change my regex to ignore head tags inside double or single
> quotes?
I'd suggest
$re = <<
~
<\w+ \b
(?: " [^"]* " | ' [^']* ' | [^"'>]+ )*
>
|
| [^<]+
| <
~six
HTML;
This should be able to parse most html or html-alike streams, even
hopeless mailformed.
This is how it works with your example:
///
$html = 'text
more text';
preg_match_all($re, $html, $m);
print_r($m[0]);
///
output:
Array
(
[0] => text
[1] =>
[2] =>
[3] =>
[4] =>
[5] =>
[6] => more text
)
--
gosha bine
extended php parser ~ http://code.google.com/p/pihipi
blok ~ http://www.tagarga.com/blok
Re: Regex to get the <html></html>
am 02.08.2007 19:39:12 von FFMG
Rik;84869 Wrote:
> On Thu, 02 Aug 2007 17:48:24 +0200, FFMG
>
> wrote:
> > I want to get the code and a 'simple?' solution seems to be
> > be...
> >
> > preg_match_all("/<[html]+[^>]*>\s*(.*\s*)<\/html>\s*/i", $html,
> > $matches, PREG_SET_ORDER);
>
> Euhm, nope. you start on an undefined tag (lose the blockquotes around
>
> '[html]'), and you;re matching the html tag, not the head tag.
>
Of course, thanks. Must have been a typo.
Rik;84869 Wrote:
>
>
> DOM functions?
>
> > How can I change my regex to ignore head tags inside double or
> single
> > quotes?
>
> Could be done by setting a greedy match starting on a quote untill the
>
> endquote. Then again, if you're concerned with invalid attributes,
> you'd
> have to allow for the possibility the quotes are erronous too, i.e.
> someone forgot to open or close them.
>
> I've taken a stab at it with regexes in the past, which works quite
> well
> as long as you can be sure it's stricly valid HTML. If it isn't, or
> you're
> using outside sources where this isn't known, don't use regular
> expressions for something a parser ought to be doing.
> --
> Rik Wasmus
Thanks, are you suggesting that I walk the text, first look for the
open tag, then look for the close tag that is not within a quote?
I guess a simple function could do that.
Would you know of such function or would I need to write one :)?
FFMG
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Re: Regex to get the <html></html>
am 02.08.2007 19:42:56 von gosha bine
Rik wrote:
> DOM functions?
Yes, or a SAX parser like pear HTML_SAX. DOM is still too picky about
invalid html.
> I've taken a stab at it with regexes in the past, which works quite well
> as long as you can be sure it's stricly valid HTML. If it isn't, or
> you're using outside sources where this isn't known, don't use regular
> expressions for something a parser ought to be doing.
Yes, regexps suck as a parser, however in most cases you need just a
lexer and that's the job regexps do quite well.
--
gosha bine
extended php parser ~ http://code.google.com/p/pihipi
blok ~ http://www.tagarga.com/blok
Re: Regex to get the <html></html>
am 02.08.2007 21:21:07 von FFMG
gosha bine;84884 Wrote:
>
> I'd suggest
>
> $re = <<
> ~
> <\w+ \b
> (?: " [^"]* " | ' [^']* ' | [^"'>]+ )*
> >
> |
> | [^<]+
> | <
> ~six
> HTML;
>
>
This looks great, and works for all cases.
I am just curious, why does...
// --
";
// --
Return
// --
0:
1:
2:
3:
4:
5:
What are the blank/empty lines matching?
FFMG
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Re: Regex to get the <html></html>
am 03.08.2007 01:15:54 von gosha bine
FFMG wrote:
> gosha bine;84884 Wrote:
>> I'd suggest
>>
>> $re = <<
>> ~
>> <\w+ \b
>> (?: " [^"]* " | ' [^']* ' | [^"'>]+ )*
>> |
>> | [^<]+
>> | <
>> ~six
>> HTML;
>>
>>
>
> This looks great, and works for all cases.
>
> I am just curious, why does...
> // --
>
>
> ";
>
> // --
> Return
> // --
> 0:
> 1:
> 2:
> 3:
> 4:
> 5:
>
> What are the blank/empty lines matching?
>
> FFMG
>
>
2 and 4 match newlines that are there after head and meta tags.
--
gosha bine
extended php parser ~ http://code.google.com/p/pihipi
blok ~ http://www.tagarga.com/blok
Re: Regex to get the <html></html>
am 03.08.2007 12:20:02 von Toby A Inkster
FFMG wrote:
> I want to get the
code and a 'simple?' solution seems to be
> be...
There is no simple solution. In HTML, the start and end tags for the
element are *optional* -- in other words, the following valid
document is considered to have a head element containing one TITLE and
one META element:
"http://www.w3.org/TR/html4/strict.dtd">
Foobar
Foobar
Foo bar baz.
Your regular expression will not find the element, which *is*
there, even if you can't explicitly see the beginning and end!
Best to use PHP's DOM stuff, as Rik mentioned.
--
Toby A Inkster BSc (Hons) ARCS
[Geek of HTML/SQL/Perl/PHP/Python/Apache/Linux]
[OS: Linux 2.6.12-12mdksmp, up 43 days, 13:49.]
Command Line Interfaces, Again
http://tobyinkster.co.uk/blog/2007/08/02/command-line-again/