Multiple condition not checking in one if statement in javascript

I am having the following code. I want to check both condition and then push the value to array. But here the condition not working for me. I can't figure it out the issue. Does anyone knows?. Help really appreciated. Thank you.

let images        = document.getElementsByTagName('img'); 
    let srcList   = [];
    for(var i = 0; i < images.length; i++) {
      let img  = images[i].src;
      let res  = img.match(/ajax|email|icon|FB|social|small|close/gi);
      let width = images[i].naturalWidth;
      if((res==null)||(width >=150)) {
       srcList.push(img);    
      }      

    }