How do you replace underscores?

Hi there,

Was just wondering how I would go about changing URLs that used to look like this :

https://www.example.com/news/detail/this_is_my_news_story_slug

to

https://www.example.com/news/detail/this-is-my-news-story-slug

(The example.com is obviously just an example in this case ?? ).

My problem is that the existing URLs are news posts so could have many underscores in them or only a few depending upon the title of the news post.

Thanks to anyone in advanced for any help with this.

Best wishes,

Mark