How to search and correct html tags and attributes?

In my application, I have to fix all the closing tags of the <img> tag as shown below. Instead of closing the <img> with a >, it should close with />.

Is there any easy way to search for all the <img> in this text and fix the > ?

(If it is closed with a /> already then there is no action required).

Other question, if there is no "width" or "height" to the <img> specified, what is the best way to solve the issue?

Download all the images and get the corresponding attributes of width and height, then add them back to the string?

The correct <img> tag is the one that closes with /> and have the valid width & height.

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Regular expressions will solve the problem with closing your tags correctly - make sure whatever you're using to edit your code supports regular expression searching, and then search for something like this (assuming that all of your unclosed image tags end with a ">):

\<img (.*?)"\>

and replace it with this:

<img $1" />

As far as the bit about the width and height attributes, if you're trying to display the images at their regular width and height, you shouldn't need them. The only time you should need width and height is if you're displaying the image at a different size than the original image's size, which doesn't appear to be the case here.