How do you search and replace page breaks in Libre Office?

This post in a LibreOffice mailing list suggests the AltSearch plugin. It says on the plugin page that it is capable of

• Searching out manual page and column break and their set up or deactivation

Quite a hack, but I'd suggest unzipping the .odt file and working with raw XML. The content.xml seems to be the correct file to edit.

I have prepared a test file with content:

QQQQQ
-page break-
AAAAA

And here is the relevant part of the raw XML:

<!---*lots* of declarations--->
<office:automatic-styles>
    <style:style style:name="P1" style:family="paragraph" style:parent-style-name="Standard">
        <style:paragraph-properties fo:break-before="page"/>
    </style:style>
</office:automatic-styles>
<office:body>
    <office:text text:use-soft-page-breaks="true">
        <text:sequence-decls>
            <text:sequence-decl text:display-outline-level="0" text:name="Illustration"/>
            <text:sequence-decl text:display-outline-level="0" text:name="Table"/>
            <text:sequence-decl text:display-outline-level="0" text:name="Text"/>
            <text:sequence-decl text:display-outline-level="0" text:name="Drawing"/>
        </text:sequence-decls>
        <text:p text:style-name="Standard">QQQQQ</text:p>
        <text:p text:style-name="P1">AAAAA</text:p>
    </office:text>
</office:body>
<!---some happy-end--->

(The real file will proably be more complex.) It seems to me that "P1" is a style created to "bear" the property of page-breaking before the paragraph. So two things come into my mind:

• remove "P1" from <text:p /> tags
• remove the page-breaking property from "P1" style

By the way, here I'd also recommend avoiding regexes in favor of some real XML parser.