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Hi @rcharaoui,
Thanks for reaching out! It looks like your query may be down to personal preference.
However, I checked the current site at http://www.zimba.ch, and it looks like all pages have www in the URL. So perhaps you should use www in the search/replace.
You can also check the page Settings >> General in your dashboard to confirm if the WordPress Address (URL) and Site Address (URL) values have www. If so, you should also use the www version.
I hope this helps. Let us know if you have any other questions.