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<?php $string = "Today is - Friday and tomorrow is - Saturday"; var_export( preg_replace('/(?:[^-]*?\K\s*-){2}.*/', '', $string) );
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
'Today is - Friday and tomorrow is'

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