PHP：正则表达式字母数字和一些特殊字符

Question

I want to use a regex to limit the characters allowed. That is:

a - z /* a to z */
A - Z /* A to Z */
0 - 9 /* 0 to 9 */
_ - /* underscore & dash */
~ ! @ # $% ^ & * () /* allowed special characters */

and this is my regex function:

function validChr($str) {
    return preg_match('/^[A-Za-z0-9_~\-!@#\$%\^&*\(\)]+$/',$str);
}

I've actually tried it and the result as I want, but I still was not sure. Is my regex is correct? Or are there other forms regex? Please help as I am still new about this regex. Thank you.

Answer 1

It works as it should.

You should only add \ before * to escape it.

Check it out here: Regular expression test