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@ 2019-06-11T05:25:19Z

<?php

$str = '-._~%:/?#[]@!$&\'()*+,;=';
$str = preg_quote( $str , '/');
$str = "/[" . $str . "]/";
echo $str;

$value = "@";
//$value = "@$$$$";
//$value = "++++;";
//$value = ":::";

  if (preg_match($str,$value) == 1) {
    echo "不正な文字です";
  }else{
      echo "有効な文字です";
  }

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
preg_quote: documentation ( source)

preferences:dark modelive preview

45.87 ms | 402 KiB | 5 Q