The dialog appears different because I displayed the Find tab and it's different than the Replace tab. 
Using Regular Expressions would be a solution to this problem but there's a design problem doing that within RoboHelp. You can use regular expressions in the Find settings but not in the Replace settings. The solution to anything other than a manual edit has to be regular expressions using a tool other than RoboHelp. The freeware Text Crawler is one example. This does of course depend on whether you know how to use regular expressions. If not, maybe one of your developers could help? Not all developers are skilled in their use so don't take that as being part of their skillset.
<a href="javascript:BSSCPopup('../Gloss/Default_g.htm');" id="A3">default</a>
You defined <a href="../Gloss/Default_g.htm">default</a> as what you want and if you remove what I have coloured red, that is what you get.
The regular expression would find the whole string and because of the way it is written, it would split it into five parts. In the Replace expression, it would delete parts two and four leaving one, three and five. The beauty of regular expressions is that they can capture strings such as _g and A3 even though the characters vary from one find to another.
Before embarking on this, create a backup first. You can wreck a project much quicker than you can create it. Warp speed by comparison. I always recommend creating the backup as a zip file. That prevents you opening it accidentally and working on it before you realise it was the backup. This way you always have a clean backup that can be used to create a new clean copy time after time.
See www.grainge.org for RoboHelp and Authoring information
@petergrainge
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