Delete text

How can blocks of text - e.g. XML strings - be deleted within @Voice?

I think this is happening for some users because @voice text replacement (edit speech menu) sees the raw XML/HTML version, even though it displays and speaks readable text by default. It's pretty easy to accidentally break that functionality inadvertently with a regular expression that creates broken HTML that can't be converted into text as it should be. Similarly, HTML code can break regular expressions that would be functional on text that did not come from an XML/HTML source.

I wonder if a simple solution could be to provide a user setting to choose whether text replacement sees the raw version of a file (advanced) or one that has been converted into readable text (basic)?

That is true.  It's also true that designing text replacement regex becomes vastly more complex when having to account for the variance introduced by HTML code e.g. hyperlinks, script tags, etc.  There would be situations where working on the HTML would be preferable, and others where dealing only with as-displayed text would be best.  In my case, in the vast majority of cases I do not want to deal with the raw HTML for anything, as it often necessitates cumbersome extra steps to provide @voice with clean non-html text (the app is very good at displaying even difficult HTML from EPUB or web sources).  @voice with a good set of regex rules is so good at text processing that I sometimes wish I could output the end-product text to a file as well as generate audio from it!
 
Just my two cents as someone who uses your app extensively.