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Thank you for responding. Although by mistake, my question was the other way around. I now have underscores and intend to go to hyphens. My hesitation is about double quote. So you would advice to go from "victoria_s_secret-frais_monde" to "victoria-s-secret--frais-monde" with making 301 redirections? Some of the urls might have some juice. Thank you.

Hello. I am thinking of changing the hyphens to underscores. The problem is that i have a magento extension for improved navigation and if you choose to use hyphens for special characters it will not let you choose this also for separating attributes. It will allow you only bouble hyphen.

So when i go to sub-category  https://www.shoponline.gr/peripoihsh/somatos/kremes-somatos/ and filter two brands (victoria's secret and frais monde) it returns the url https://www.ishoponline.gr/peripoihsh/somatos/kremes-somatos/victoria-s-secret--frais-monde instead of the iniital url with undescore which was https://www.ishoponline.gr/peripoihsh/somatos/kremes-somatos/victoria_s_secret-frais_monde. So it is "victoria-s-secret--frais-monde" vs "victoria_s_secret-frais_monde".

Any suggestions? Thank you in advance.