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@ 2018-12-17T21:35:52Z

<?php
$string = 'SELECT * FROM site_customers LEFT JOIN site_products';
$patterns = array(
    '/\b(site_customers)\b/',
    '/\b(site_products)\b/'
    );
$replacements = array(
    '${1}_02',
    'new_$1'
    );
echo preg_replace($patterns, $replacements, $string);

Output
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preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

27.27 ms | 404 KiB | 5 Q