How allowed “–“, “—” or any other symbol in terms(category) URL.
Now WordPress replace from “–” to “-“
ps.I`m using to Subdomain plugin. And IDN subdomain Example: xn--…site.com/ There xn-- is category (url)
How to allow — in category name
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The — to an mdash conversion happens inside wptexturize() http://codex.wordpress.org/Function_Reference/wptexturize which is applied to many things (including taxonomy titles and other functions output.
Look for places you might want to remove the filter from in wp-includes/default-filters.php and remove the filter with the remove_filter() function: http://codex.wordpress.org/Function_Reference/remove_filter