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<?php echo '<pre>'; preg_match('/^(LEFT JOIN|RIGHT JOIN|INNER JOIN|JOIN)(?: +)([^ ]+)(?: +)ON(?: +)(.*)$/i', 'JOIN Skill ON Skill.SkillID = EmployeeSkill.SkillID', $matches); print_r($matches);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 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 - 7.2.33, 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 - 8.2.20, 8.3.0 - 8.3.8
<pre>Array ( [0] => JOIN Skill ON Skill.SkillID = EmployeeSkill.SkillID [1] => JOIN [2] => Skill [3] => Skill.SkillID = EmployeeSkill.SkillID )

preferences:
283.74 ms | 406 KiB | 464 Q