Php - preg_match examples

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The preg_match examples source code:
<html> <body> <? echo '<h2>Preg match [code] example:</h2><br />'; $string='This is before the code brackets [code]We are inside the square brackets[/code] And again after'; /*Pay attention to the '\' character - The pattern we are looking for is matched by the (.+) which we could have changed to (.*) to also retrieve an empty string.*/ preg_match("/\[code\](.+)\[\/code\]/",$string, $results); echo 'Results: '.$results[1]; echo '<h2>Preg Match '.htmlentities('<head>').' example:</h2>'; $string='<html><head something which is often inputed here><title>Title</title><meta name="description" content="description of your page" /></head><body>The body of your page<br />some text...</body></html>'; /*Note the use of '/smU' which is very useful for case insensitive matching and other features (report to the pattern modifiers manual)*/ preg_match("/<head.*>(.*)<\/head>/smU",$string, $results); echo 'Results: '.htmlentities($results[1],ENT_QUOTES); echo '<h2>Preg Match meta description example:</h2>'; /*Note the use of '^' which negate a pattern*/ preg_match("|<meta[^>]*description[^>]*content=\"([^>]+)\"[^>]*>|Ui",$string, $results); echo 'Results: '.$results[1]; /*A very famous example here:*/ echo '<h2>Host from Url example:</h2>'; $url='http://www.linkstraffic.net/traffic.php'; preg_match('@^(?:http://)?([^/]+)@i',$url, $matches); $host = $matches[1]; echo '<br />Host: '.$host.'<br />'; preg_match('/[^.]+\.[^.]+$/', $host, $matches); echo "domain name is: {$matches[0]}<br />"; /*The Charset example*/ $string='<meta http-equiv="content-type" content="text/html; charset=gb2312">'; echo '<h2>Charset Example</h2>'; preg_match("/<meta[^>]*http-equiv[^>]*charset=(.*)(\"|')>/Ui",$string, $results); echo 'Results: '.$results[1]; /*The input value example (we have the name)*/ $string='<input type="text" name="thename" value="somevalue" />'; echo '<h2>Input value example</h2>'; preg_match("/<input[^>]*name=\"thename\"[^>]*value=[\"|'](.*)[\"|']/Ui",$string, $results); echo 'Results: '.$results[1]; /*preg_match_all example with text contained inside [url] tags to extract*/ $string='some text before [url]http://www.newo17.com[/url] and another url here: [url]http://www.remotehireman.com[/url]. Check out the links if you have time ;).'; echo '<h2>preg_match_all example</h2>'; echo '<p><u>Text to parse</u>:<br /> '.$string.'</p>'; preg_match_all("|\[url\](.*)\[\/url\]|U",$string,$results,PREG_SET_ORDER); foreach ($results as $val) { $string=str_replace($val[0],'<a href="'.$val[1].'" target="_blank">...'.substr($val[1],-20).'</a>',$string); } echo '<u>Extracted text</u>:<br />'.$string.'</p>'; ?> </body> </html>

When working with this function, you should have a close look to these pages:
- manual/en/function.preg-match
- manual/en/reference.pcre.pattern.syntax
- reference.pcre.pattern.modifiers

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Php - preg_match examples

Php - preg_match examples

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