--20cf303f6948ac312304a7f2c086
Content-Type: text/plain; charset=UTF-8
Reading some code from the web spider,got the such a expression :
preg_match("@
It's about get the head content of a website,i wanna know the match detail
..Could someone give some tips ,
thanks in advance .
All you best
------------------------
What we are struggling for ?
The life or the life ?
--20cf303f6948ac312304a7f2c086--
------=_NextPart_000_0139_01CC4176.9164F200
Content-Type: text/plain;
charset="UTF-8"
Content-Transfer-Encoding: 7bit
That Regex actually has an unnecessary part to it - it would be better to
write it like:
/\
I added /m modifier, telling it that the search is performed in Multiline
basis. Added "head_tag_innerHTML" named reference for you, so writing this
Regex in PHP like this:
preg_match( '/\
$subject , $matches )
will place search results inside $matches and you can access your captured
content, i.e. HEAD's value in $matches['head_tag_innerHTML'].
I also replaced your delimiters for better clearance...
It will fetch EVERYTHING that comes inside HEAD tag, i.e. its value/innerHTML.
Putting ? after * makes it to perform *ungreedy* scan. And escaping all
possible Regex characters [including <, >, ? etc] is a good practice.
Shehi
-----Original Message-----
From: who.cat@gmail.com [mailto:who.cat@gmail.com] On Behalf Of who.cat
Sent: 13 iyul 2011 15:43
To: php-db@lists.php.net
Subject: [PHP-DB] how does this regular expression works
Reading some code from the web spider,got the such a expression :
preg_match("@
head content of a website,i wanna know the match detail .Could someone give
some tips , thanks in advance .
All you best
------------------------
What we are struggling for ?
The life or the life ?
------=_NextPart_000_0139_01CC4176.9164F200
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------=_NextPart_000_0139_01CC4176.9164F200--
On 13 July 2011 14:04, Shahriyar Imanov
> \
Options: case insensitive; ^ and $ match at line breaks
Match the characters â=9C
=BB
Between zero and unlimited times, as few times as possible,
expanding as needed (lazy) «*?»
Match the character â=9C>â=9D literally «>»
Match the regular expression below and capture its match into
backreference with name â=9Chead_tag_innerHTMLâ=9D
«(?P
Match any single character that is not a line break character «.*?=
»
Between zero and unlimited times, as few times as possible,
expanding as needed (lazy) «*?»
Match the characters â=9Câ=9D literally «=C2=
=BB
Created with RegexBuddy
Escaping < > ? at the wrong time is simply a redundancy. Learning when
to escape is just like learning a new language.
You only need to escape anything if you need it to be a literal character.
e.g.
something.html vs something\.html
--=20
Richard Quadling
Twitter : EE : Zend : PHPDoc
@RQuadling : e-e.com/M_248814.html : bit.ly/9O8vFY : bit.ly/lFnVea
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On 13 July 2011 13:42, who.cat
>
Options: case insensitive; ^ and $ match at line breaks
Match the characters â=9C
Between zero and unlimited times, as many times as possible, giving
back as needed (greedy) «*»
Match the character â=9C>â=9D literally «>»
Match the regular expression below and capture its match into
backreference number 1 «(.*?)»
Match any single character that is not a line break character «.*?=
»
Between zero and unlimited times, as few times as possible,
expanding as needed (lazy) «*?»
Match the characters â=9Câ=9D literally «=C2=
=BB
Created with RegexBuddy
--=20
Richard Quadling
Twitter : EE : Zend : PHPDoc
@RQuadling : e-e.com/M_248814.html : bit.ly/9O8vFY : bit.ly/lFnVea
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