how to replace text with Search and Replace with regex on Calibre

[darrnih]

So, I have a book I'm listening to using text-to-speech, but at the start of each chapter, the heading is written twice. With the tags "<h1>" and "<p>".
This ends up showing the title of the chapter in both heading and normal fonts, which isn't an issue when reading, but when listening, the text-to-speech will have to repeat it twice which is a bit annoying.
To solve this, I downloaded calibre and discovered Regex, so I went about a beginner tutorial and realised that I could isolate each instance this happened.
If I have something like

Chapter 21: The New Beginning
Chapter 21: The New Beginning

Which would appear like this in the editor.

<h1>Chapter 21: The New Beginning</h1>
<p>Chapter 21: The New Beginning</p>

By running the code below in the search tab to search through the entire file

<h1.*?>Chapter .*?</h1>
    <p>Chapter.*?</p>

I'm able to capture any instance of the title appearing twice.
My issue is this, by pasting

<h1.*?>.*?</h1>

in the replace tab, instead of it replacing the text with what was supposed to be inside the "<h1>" tag, so in this case I expect to see

Chapter 21: The New Beginning

Instead I get,

<h1.*?>.*?</h1>

Is there a way to save the string gotten from the first code into the second

[DNSB]

Try wrapping the .*? in brackets. i.e. (.*?) which can be referenced by number. In the preplacement box, the first instance of (.*?) would be represented by \1, the second by \2, etc.

In your case I would use <h1 class="(.*?)">(.*?)</h1> <p class=".*?">.*?</p> as the search string and <h1 class="\1">\2</h1> as the replacement string.

If the classes are fixed, you could simply use <h1 class="whatever">(.*?)</h1> and \1 for the chapter title in the replacement string.

A quick visit to Regex 101 and playing with their test environment is a good idea.

[darrnih]

Thank you very much. It worked