How to check, if a php string contains only english letters and digits?

Question

In JS I used this code:

if(string.match(/[^A-Za-z0-9]+/))

but I don\'t know, how to do it in PHP.

Answer 1

PHP can compare a string to a regular expression using preg_match(regex, string) like this:

if (!preg_match('/[^A-Za-z0-9]+/', $string)) {
    // $string contains only English letters and digits
}

Answer 2

if (preg_match('/^[\w\s?]+$/si', $string)) {
    // input text is just English or Numeric or space
}

Answer 3

Have a look at this shortcut

if(!preg_match('/[^\W_ ] /',$string)) {

}

the class [^\W_] matches any letter or digit but not underscore . And note the ! symbol . It will save you from scanning entire user input .