I'm revealing my embarrassing ignorance of REGEX-fu here, but: I currently have a website where a load of the articles' URLs are written as "article_name", whilst the newer ones are written as "article-name".

I want to move all of them to using dashes, so is there a regular expression I could use to rewrite the older URLs to their newer equivalents?

Thanking you in advance!

regex mod-rewrite
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