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<?php $text = '<span style="font-size: small;">test</span><span>Span2</span>'; $text = preg_replace('/<span[^>]*>(.*)<\/span>/Ui', '\\1', $text); var_dump($text); //string(9) "testSpan2"
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.1 - 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(9) "testSpan2"
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/jL8lu on line 6
Process exited with code 255.

preferences:
361.01 ms | 401 KiB | 460 Q