php - Regex Help - need to allow % in a regex formula

Question

i have a function which checks whether a URL contains any special characters and i want to add '%' to the allowed as i'm using %PREFIX% as a container. I'm relatively new to Regex and was wondering if someone could help me to add the % to the allowed list. The function is the below:

function specialChars($url)
{       
    if (preg_match('|^http(s)?://[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(/.*)?$|i', $url) != true)
    {
        $this->errors[] = "Please remove any special characters";           
    }       
}

Thanks in advance. Regards,

Answer 1

正如http://www.regular-expressions.info/reference.html所解释的，[]（及其内容）定义了一个字符类。

由于 % 不是字符类（或根本不是）内的元字符，因此您可以将其放置在您希望允许它进入的字符类中，例如[a-z0-9-%]