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<?php //heredoc $data = <<<__DATA__ ddd_DDD foo_FOO foo_FOD foo_bar FOO_foo ccc_cCc ddd_ddd __DATA__; $pattern = '~^([a-z]{3})_(?=[A-Z]{3})(?i:\1)$~'; echo "<pre>"; //foreach(preg_split('~[\r\n]+~', $data) as $key => $line){ foreach(explode("\n", $data) as $key => $line){ echo $key . " => " . $line . " => " . (preg_match( $pattern, $line, $matches) === 1 ? "true" : "false") . "<br>"; } echo "</pre>";
Output for git.master, git.master_jit, rfc.property-hooks
<pre>0 => ddd_DDD => true<br>1 => foo_FOO => true<br>2 => foo_FOD => false<br>3 => foo_bar => false<br>4 => FOO_foo => false<br>5 => ccc_cCc => false<br>6 => ddd_ddd => false<br></pre>

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