在string中的每个属性之前添加变量

I am walking through some attributes in a shortcode in wordpress with code. I got all attributes in one string. Like this:

$var = 'type="text" title="super title" class="master-module"';

I want to convert it to:

$var = 'data-type="text" data-title="super title" data-class="master-module"';

I have tried to understand using preg replace but I terrible at regex.

Any help is appreciated.

You can use a regex like this:

(\w+=")

Working demo

And this replace string:

data-$1

You can see the match and capturing groups in green and in the substitution section your resulting string after applying the replacement string.

The php code:

$re = "/(\\w+=\")/"; 
$str = "\$var = 'type=\"text\" title=\"super title\" class=\"master-module\"';

"; 
$subst = "data-\1"; 

$result = preg_replace($re, $subst, $str);

Update: If you have an attribute with dashes like heading-type="xxx xx" then you can use this regex instead:

([\w-]+=")

You can explode, apply the wanted addition on every element that needs to be prefixed, and implode your string to get the expected result :

$var = 'type="text" title="super title" class="master-module"';

$var = explode (' ', $var);
array_walk ($var, function (&$a) {
  if (strpos($a, '"') !== strlen($a) - 1)
    $a = 'data-' . $a;
});
$var = implode (' ', $var);
// data-type="text" data-title="super title" data-class="master-module"

That way, you could also add an array to your array_walk call to include a list of values to modify or to exclude also.

Here is my final code and answer.

$re = '/([\w-]+=")/'; 
$str = $moduleAttribute; 
$subst = 'data-$1'; 

$result = preg_replace($re, $subst, $str);

I just have one word. Thanks! Especially thank you @fede