That Regex actually has an unnecessary part to it - it would be better to write it like: /\<head.*?\>(?P<head_tag_innerHTML>.*?)\<\/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( '/\<head.*?\>(?P<head_tag_innerHTML>.*?)\<\/head\>/sim' , $subject , $matches ) will place search results inside $matches and you can access your captured content, i.e. HEAD's value in $matches['head_tag_innerHTML']. I also replaced your delimiters for better clearance... It will fetch EVERYTHING that comes inside HEAD tag, i.e. its value/innerHTML. Putting ? after * makes it to perform *ungreedy* scan. And escaping all possible Regex characters [including <, >, ? etc] is a good practice. Shehi -----Original Message----- From: who.cat@xxxxxxxxx [mailto:who.cat@xxxxxxxxx] On Behalf Of who.cat Sent: 13 iyul 2011 15:43 To: php-db@xxxxxxxxxxxxx Subject: how does this regular expression works Reading some code from the web spider,got the such a expression : preg_match("@<head[^>]*>(.*?)<\/head>@si",$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 ?
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