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run code in 150+ php & hhvm versions
Bugs & Features
<?php $hrefPattern = '/<a\\s+[^>](*)href=(["\']??)([^"\'>]*?)\\1([^>]*)>(.*)<\/a>/siU'; $html = <<<HTML <p>If you find any cases where this code falls down, let us know using the Feedback link below.</p> <p>Before using this or similar scripts to fetch pages from other websites, we suggest you read through the related article on <a href="/php/parse-robots/" title="foobar" target="_parent">setting a user agent and parsing robots.txt</a>.</p> <h2>First checking robots.txt</h2> <p>As mentioned above, before using a script to download files you should always <a target="_blank" href="/php/parse-robots/">check the robots.txt file</a>. Here we're making use of the <tt>robots_allowed</tt> function from the article linked above to determine whether we're allowed to access files:</p> HTML; preg_match_all($hrefPattern, $html, $matches, PREG_SET_ORDER); var_dump($matches);
Output for 5.2.0 - 7.1.0
Warning: preg_match_all(): Compilation failed: nothing to repeat at offset 10 in /in/XUGSb on line 22 NULL
Output for 4.3.11 - 4.4.1, 4.4.3 - 5.1.1, 5.1.3 - 5.1.6
Warning: preg_match_all(): Compilation failed: nothing to repeat at offset 10 in /in/XUGSb on line 22 array(0) { }
Output for 4.4.2, 5.1.2
Warning: preg_match_all(): Compilation failed: nothing to repeat at offset 10 in /in/XUGSb on line 23 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: nothing to repeat at offset 10 in /in/XUGSb on line 22 array(0) { }