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$reg = "/(\d{2})\/(\d{2})\/(\d{4})/e";
$text = '01/25/2009到02/02/2009';
$replace = "\${3},\${1}";
echo preg_replace($reg, $replace, $text); //报错syntax error, unexpected ','
……
$replace = "'\${3},\${1}'";
……