Help: Regex Find & Replace Chapter Numbers In Words To Incremental Digits?

[Bozana]

I have a book that needs to replace all the chapter headings in h2 that are in words to digits/integers and increment them. I'm using Calibre Editor but happy to jump over to sigil too, to get this Epub sorted.

Example:

<h2 class="heading_sed1">

<p class="class_sex">Chapter</p>

<p class="class_sez">Eighty-One</p>

</h2>

To

<h2 class="class_sex">Chapter 81</h2>


So far, I have the search part correct with either versions:

(?s)(<h2[^<>]*>)(.+?</h2>)

Or

<h2 class="heading_sed1">

<p class="class_sex">Chapter</p>

<p class="class_sez">[a-zA-Z0-9]+</p>

</h2>

However, it's my regex replace that's giving me trouble:

<h2 class="class_sez">Chapter \i+</h2>


Is there a way to accomplish this, without manually renaming them all?

And this book has part 1 and part 2 and the increments has to start over again in part two, in the same book.

I'm grateful for any help.

Thank you!

Kindest regards,

Bozana

[skil-phil]

Hi,
I had the same problem.
What worked for me was using the 'editor chains' plugin.
Took a while to set it all up but once done one press and all is done.
Did another to covert Roman numerals as well.
HTH.
Phil

[lomkiri]

You may have a look on this thread or this message to see how to use a regex-function to numerate by increment

In your case, the function could be something like :

def replace(match, number, file_name, metadata, dictionaries, data, functions, *args, **kwargs):
    data['counter'] = data.get('counter', 0) + 1
    return f'<h2 class="class_sez">Chapter {data["counter"]}</h2>'

Note : Works only "replacing all"
For a correct numeration, be sure to be on the first page of the epub when starting the "replace all"

If you want to reset the counter at each "Part nn", capture the expression of the title of the part in a group (group 1 in my exemple) with an expression like :
(<h1[^<>]*>Part \d</h1>)|(?:<h2[^<>]*>.+?</h2>)
(up to you to adapt it to your epub)

and use a function like :

def replace(match, number, file_name, metadata, dictionaries, data, functions, *args, **kwargs):
    
    # Found a new part:
    if match.group(1):
        data['counter'] = 0
        return match.group(0)

    # else, found a chapter:
    data['counter'] = data.get('counter', 0) + 1
    return f'<h2 class="class_sez">Chapter {data["counter"]}</h2>'