How do I find and replace space symbols at the beginning of a string?
This would find a space before and a space after some text. EDIT: LO 6.4.5.2 on Linux.
Maybe \sstring, being string what the OP had in mind.
I see, thanks. May be a bug in both versions (mine, that select all spaces, and yours, that select before Enter).
\b is for word boundary
I will test this a bit more.
EDIT: I tested on 7.1.8.1, and works as you wrote.
You surely mean paragraph instead of string?
FIND&REPLACE - regular expressions -
Finds the first space(s) of a paragraph:
^\s*
or
^\s+
or
^[:space:]*
More information:
https://help.libreoffice.org/latest/bs/text/swriter/guide/search_regexp.html
https://help.libreoffice.org/7.3/he/text/shared/01/02100001.html
https://wiki.openoffice.org/wiki/Documentation/How_Tos/Regular_Expressions_in_Writer
LibreOffice uses ICU terms:
EDIT
Changed link to regex LibreOffice, added link to wiki.
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Or try \s\b for Find by regular expressions
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Hmm. Why the obsolete reference for v.4.4, when your previous link already contains a reference (at the bottom) to the up-to-date version of the same page? 
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Mike, you’re right. I corrected my answer… 
Thanks for your hint.