[lomkiri]

====== Important ======

I realized that a paragraph starting with " — «" and with no further dialog will be split, that is not wanted (and thus you cannot pass the function twice without bad effects). So the new function is :

def replace(match, number, file_name, metadata, dictionaries, data, functions, *args, **kwargs):
    import regex

    # Moodify this if you change the form the dialog begins
    abort_if_starting_with_emdash = regex.match('\\s—', match[3])
    
    if match[2] or abort_if_starting_with_emdash:
        return match[0]
    
    else:
        return match[1] + match[3] +'</span></p>\n\n  ' + match[1] + ' — ' + match[4]

This one can be executed twice, and doesn't split either a paragraph with only one dialog.

Anyway, it is advisable to always make a backup of your file when you apply new regexes in "replace all" mode. And to check the result with the button "See what was changed".

Another considerations :
— in french, you need a non-break-space or a narrow-non-break-space after "«" and before "»"
— It is better (but not mandatory) to avoid spaces at the beginning and end of paragraph (so <p class="calibre8"> <span class="calibre3"> — « blabla »</span> </p> becomes <p class="calibre8"><span class="calibre3">— « blabla »</span></p>. But apply first the function, because it is based on the form with spaces, or modify the regex (and the variable "abort_if_starting_with_emdash" in the function).