Remove empty html tags with smarty

Question

I want to remove all empty tags. Here's the regex which I've found here but it seems not to work in smarty.

regex_replace:"#<p[^>]*>(\s|&nbsp;|</?\s?br\s?/?>)*</?p>#":"";
regex_replace:"<(\w+)\s*.*?>\s*?</\1>#":"";
regex_replace:"<[^>]*>\s*<\/[^>]*>#":"";

Answer 1

The regex should be:

regex_replace:"#<p[^>]*>(\s|&nbsp;|</?\s?br\s?/?>)*</?p>#":"";
regex_replace:"#<(\w+)\s*.*?>\s*?</\1>#":"";
regex_replace:"#<[^>]*>\s*<\/[^>]*>#":"";

The # was missing as @user2182349 mentioned.