I want to change the following:
when a line starts with \t (i.e. TAB)
I want to merge it with the previous one.
So: when I find a tab at the beginning of the line, remove the previous paragraph break.
You probably need to use the AltSearch extension, https://extensions.libreoffice.org/en/extensions/show/70066
In its Find enter \p\t
In its Replace enter either a space or \t for a tab, or whatever you want as replacement
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