I have written a function to copy text from a textarea but I need to have a particular code block executed if the user is using an apple mobile device.

I tried the following statement

if (navigator.userAgent.match(/iphone|ipod|ipad/)) {
 // code
}

but it doesn't seem to work very well.

Do you have any suggestions?

/* Full code */

function copy(copyText) {
  if (navigator.userAgent.match(/iphone|ipod|ipad/)) {
    // handle iOS devices
    copyText.contenteditable = true;
    copyText.readonly = false;

    var range = document.createRange();
    range.selectNodeContents(input);

    var selection = window.getSelection();
    selection.removeAllRanges();
    selection.addRange(range);
    input.setSelectionRange(0, 999999);
  } else {
    // other devices are easy
    copyText.select();
  }
  document.execCommand("copy");
}