How do you score the Mayor in an unfinished city at the end of a game of Carcassonne?


Question: Using regular expressions to find img tags without an alt attribute
Answer: This is really tricky, because regular expressions are mostly about matching something that is there. With look-around trickery, you can do things like 'find A that is not preceded/followed by B', etc. But I think the most pragmatic solution for you wouldn't be that.

My proposal relies a little bit on your existing code not doing too crazy things, and you might have to fine-tune it, but I think it's a good shot, if you really want to use a RegEx-search for your problem.

So what I suggest would be to find all img tags, that can (but don't need to) have all valid attributes for an img-element. Whether that is an approach you can work with is for you to decide.

Proposal:

/&lt;img\s*((src|align|border|height|hspace|ismap|longdesc|usemap|vspace|width|class|dir|lang|style|title|id)="[^"]"\s*)*\s*\/?&gt;/


The current limitations are:


It expects your attribute values to be delimited by double quotes,
It doesn't take into account possible inline on*Event attributes,
It doesn't find img elements with 'illegal' attributes.