$re = '/[^\pL\pN\\\\]+/u';
$str = '"bananaã€xxã€tyuã€fdg dfgdfã€dfgfdgdã€dfdfgã€dfgdg ã€cvbcvb", dfdgd
sdfs. 2te. 459,202\' dfg/ dfg, bvn, bn, wqe。uyo.
yuo, "yuouyã€yuoyã€jlkjã€nmj , tryrtã€346,457ã€ghã€325352 ã€fghfg"';
$subst = " ";
$result = preg_replace($re, $subst, $str);
echo "The result of the substitution is ".$result;
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php