Hi @elarpa,
Better Search Replace Support Team here. Thanks for reaching out with your query! We would be happy to assist.
The plugin would be able to search and replace texts saved in the database. Sometimes, line breaks are due to the formatting of a site. You may need to check first if frontend styling is responsible for the line breaks.
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Otherwise, you may need to check the database how the line breaks are saved. Please do let us know how it goes.