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<?php $value = '2010-10-21 54:254'; //$pattern = '(\d{4}(-\d{2})?(-\d{2})?( \d{2})?(:\d{2})?(:\d{2})?)'; $pattern = '^[(\d{4}-\d{2}-\d{2} \d{2}:\d{2}(:\d{2})?)]+$'; var_dump(preg_match('/' . $pattern . '/', $value));
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: preg_match(): Compilation failed: invalid range in character class at offset 11 in /in/s9MC5 on line 9 bool(false)
Output for 7.3.0 - 7.3.33
Warning: preg_match(): Compilation failed: range out of order in character class at offset 10 in /in/s9MC5 on line 9 bool(false)
Output for 5.4.41 - 5.4.45, 5.5.10 - 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
Warning: preg_match(): Compilation failed: invalid range in character class at offset 10 in /in/s9MC5 on line 9 bool(false)
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 - 5.4.40, 5.5.0 - 5.5.9
int(1)

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