Re: [PHP-DB] how does this regular expression works
On 13 July 2011 13:42, who.cat wrote: > ]*>(.*?) ]*>(.*?) Options: case insensitive; ^ and $ match at line breaks Match the characters “” «[^>]*» Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*» Match the character “>” 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 “” literally «» Created with RegexBuddy -- Richard Quadling Twitter : EE : Zend : PHPDoc @RQuadling : e-e.com/M_248814.html : bit.ly/9O8vFY : bit.ly/lFnVea -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] how does this regular expression works
On 13 July 2011 14:04, Shahriyar Imanov wrote: > \(?P.*?)\<\/head\> (?P.*?) Options: case insensitive; ^ and $ match at line breaks Match the characters “” literally «>» Match the regular expression below and capture its match into backreference with name “head_tag_innerHTML” «(?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 “” literally «» 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 -- Richard Quadling Twitter : EE : Zend : PHPDoc @RQuadling : e-e.com/M_248814.html : bit.ly/9O8vFY : bit.ly/lFnVea -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP-DB] how does this regular expression works
That Regex actually has an unnecessary part to it - it would be better to
write it like:
/\(?P.*?)\<\/head\>/sim
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( '/\(?P.*?)\<\/head\>/sim' ,
$subject , $matches )
will place search results inside $matches and you can access your captured
content, i.e. HEAD's value in $matches['head_tag_innerHTML'].
I also replaced your delimiters for better clearance...
It will fetch EVERYTHING that comes inside HEAD tag, i.e. its value/innerHTML.
Putting ? after * makes it to perform *ungreedy* scan. And escaping all
possible Regex characters [including <, >, ? etc] is a good practice.
Shehi
-Original Message-
From: who@gmail.com [mailto:who@gmail.com] On Behalf Of who.cat
Sent: 13 iyul 2011 15:43
To: php-db@lists.php.net
Subject: [PHP-DB] how does this regular expression works
Reading some code from the web spider,got the such a expression :
preg_match("@]*>(.*?)<\/head>@si",$file, $regs); It's about get the
head content of a website,i wanna know the match detail .Could someone give
some tips , thanks in advance .
All you best
What we are struggling for ?
The life or the life ?
smime.p7s
Description: S/MIME cryptographic signature
[PHP-DB] how does this regular expression works
Reading some code from the web spider,got the such a expression :
preg_match("@]*>(.*?)<\/head>@si",$file, $regs);
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 ?
