php - Mysql REGEX Matching query -

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what correct query match string variable mysql field? example:

$var_surname = $_post['surname']; $var_surname = strtolower($var_surname);  select surname tblname lower(surname) regex $var_surname .......... ..........  if($check > 0) {     surname exists }  else  {     successful }

any appreciated.

i don't understand, why using regex (should regexp way) ? do

"select surname tblname lower(surname) = '$var_surname'"

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