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    <body><span class="vcard"><a class="email" href="mailto:raal@post.cz" title="raal <raal@post.cz>"> <span class="fn">raal</span></a>
</span> changed
          <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED NOTABUG - find replace does not work"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=122328">bug 122328</a>
          <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Resolution</td>
           <td>---
           </td>
           <td>NOTABUG
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">CC</td>
           <td>
                
           </td>
           <td>raal@post.cz
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>UNCONFIRMED
           </td>
           <td>RESOLVED
           </td>
         </tr></table>
      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED NOTABUG - find replace does not work"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=122328#c5">Comment # 5</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED NOTABUG - find replace does not work"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=122328">bug 122328</a>
              from <span class="vcard"><a class="email" href="mailto:raal@post.cz" title="raal <raal@post.cz>"> <span class="fn">raal</span></a>
</span></b>
        <pre>I can confirm with 6.3 on windows, but it's not a bug. See
<a href="https://help.libreoffice.org/Common/List_of_Regular_Expressions">https://help.libreoffice.org/Common/List_of_Regular_Expressions</a>

\n Represents a line break that was inserted with the Shift+Enter key
combination. To change a line break into a paragraph break, enter \n in the
Find and Replace boxes, and then perform a search and replace.

\n in the Find text box stands for a line break that was inserted with the
Shift+Enter key combination.

\n in the Replace text box stands for a paragraph break that can be entered
with the Enter or Return key.


Switch on formatting marks and you can see that first replace works like in
documentation - replace line break on 4th line. For searching paragraph break
tick "Regular expressions" in "Search and replace" dialog. Search for $,
replace with space.


So your steps should be:

1. created document 
2. use different ways to end line
3. use edit / find and replace; tick "Regular expressions" 
4. find \n replace all with \n
5. find $ replace all with <space></pre>
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