If you have installed OOO 3.0 or higher version then it seems that internal Index-Entries syntax is supposed to extended little bit. It seems that all of the Regex Strings is supposed to be deleted.
Code:
</text:span><text:alphabetical-index-mark-start text:id="[^"]*"/><text:span text:style="[^"]*"/>
</text:span><text:alphabetical-index-mark-end text:id="[^"]*"/><text:span text:style="[^"]*"/>
<text:alphabetical-index-mark-start text:id="[^"]*"/>
<text:alphabetical-index-mark-end text:id="[^"]*"/>
<text:alphabetical-index-mark text:string-value="[^"]*"/>
All the expressions are looking similar and single RegEx should be composed in order to handle them. you should carefully replace the matched with EMPTY string there should not be one or more blanks.
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