You can always try to do it like this;
var imgUrl = "http://sits/productimages/00670535922278.png?sw=350&sh=350;";
var splitterArray = ['.jpeg', '.png', '.jpg', '.gif'];
for (var i = 0; i < splitterArray.length; i++) {
var imgUrlArray = imgUrl.split(splitterArray[i]);
if (imgUrlArray.length > 1) {
//Do your thing here
}
}
You use a array of your extensions that will be checked, and i your string contains the extension your imgUrlArray will have a length grater than one.
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solved how do i split the url using split method by checking all the image extension