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<?php $string = 'A lead was space" ema il "@emailadds.com saved for sharon.davis@website.com, Date: 11th December 2019, Service: Car Hire ( Premium ), Extras: NA, Price: £300'; echo preg_replace('/(?:[^"\s@]+|"[^"]*")+(?=@[^\s.]+\.)/', '******', $string);
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
A lead was ******@emailadds.com saved for ******@website.com, Date: 11th December 2019, Service: Car Hire ( Premium ), Extras: NA, Price: £300

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111.61 ms | 1402 KiB | 4 Q