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<?php $html = <<<HTML <div> <h1>title</h1> and <h2>title 2</h2> <h2 data-formula="a > b" class="regex_is_DOM_unaware">Monkeywrench</h2> <h1 class="classname">test <span>This isn't even a </h tag</span></h1> </div> HTML; var_export( preg_match_all( '|<\s*h[1-2](?:.*)>(.*)</\s*h|Ui', $html, $matches ) ? $matches[1] // capture group 1 : [] ); /* Desired result but not what is provided: array ( 0 => 'title', 1 => 'title 2', 2 => 'Monkeywrench', 3 => 'test <span>This isn't even a </h tag</span>' ) */
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
array ( 0 => 'title', 1 => 'title 2', 2 => ' b" class="regex_is_DOM_unaware">Monkeywrench', 3 => 'test <span>This isn\'t even a ', )
Output for 4.4.3 - 4.4.9, 5.1.0 - 5.1.1, 5.1.3 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/LXXSQ on line 18
Process exited with code 255.
Output for 4.4.2, 5.1.2
Parse error: syntax error, unexpected '[' in /in/LXXSQ on line 19
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/LXXSQ on line 18
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/LXXSQ on line 18
Process exited with code 255.

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