<?php
 
$str = '[{lat: "[{"area":"-22.88975203013098", lng: "-43.12695211119432,"},…] 0 : {lat: "[{"area":"-22.88975203013098", lng: "-43.12695211119432,"} 1 : {lat: "-22.88977179811704", lng: "-43.12685018725176,"} 2 : {lat: "-22.88979650809557", lng: "-43.126624881694504,"} 3 : {lat: "-22.890513095516", lng: "-43.12649077124376,"} 4 : {lat: "-22.89054274732773", lng: "-43.126807271907516,"} 5 : {lat: "-22.88975203013098", lng: "-43.12695211119432"}]"}';
 
$pattern = '/\"\[{"area":"/s';
$str = preg_replace($pattern, " ", $str);
 
echo $str;
 

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