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Originally Posted by DiapDealer
First off: you're right. Regex is not the best tool for removing tags based on attribute values. But I don't think that's what the OP was asking for (nor what Toxaris was suggesting using regex for). The OP is asking for something that removes classes (classes that are no longer being used by CSS) from attribute strings.
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I didn't get that from the post, as he was asking to delete unused stuff from the HTML file. If you just want to delete an attribute on an HTML element, then it's not too hard (although you have to account for things like
Code:
class="first second"
That might leave you with a span that does nothing effective, but if it has other attributes, it won't be deleted as "empty" by the various tools. In other words, I couldn't figure out how he ended up with attributes that do nothing so they can be deleted safely, so I assumed he meant deleting the span/div/etc.
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By the way: both the TagMechanic plugin for Sigil, and "Diap's Editing Toolbag" for calibre make it trivial to successfully remove the tag with the class "deleteme" (along with the matching closing tag), per your example. 
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Definitely a good start, but I'm spoiled by Expression Web and the selection process it has for elements to modify (with/without attribute, containing/not containing text/tag, inside/not inside tag, with infinite nesting of these rules) plus what it can do (replace tag/contents, add before/after start/end tag, remove tag/contents, change tag, change/remove attribute), and all of it can be regexed.