<?php $line = '1:wlrb@yahoo.com:7:8.35'; var_export( array_combine( ['id', 'email_address', 'domain', 'number_of_orders', 'total_order_value'], explode(':', preg_replace('#@([^:]*)\K#', ':$1', $line)) ) ); echo "\n---\n"; // demo of replacement: echo preg_replace('#@([^:]*)\K#', ':$1', $line);
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