How can I modify the following regexp
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echo preg_replace("/,4(,|)/", ",S", "40,4,40,4"); // Outputs 40,S40,Sregards tores
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echo preg_replace("/,4(,|)/", ",S", "40,4,40,4"); // Outputs 40,S40,SCode: Select all
echo preg_replace("/(^|,)(4)(,|$)/", "\$1S\$3", "40,4,40,4"); // outputs 40,S,40,S