Regex to find consecutive new lines separated by spaces

Question

I'm using str_replace("\n\n"); to find any two consecutive new lines \n but the problem is the text I'm working with isn't uniform. The new lines aren't aways back to back. They could be separated by any number of spaces or even a tab (found one). Don't like to use regex that much, but looks like I may need one here.

Answer 1

Try this:

$output = preg_replace('/\n\s*\n/s', '', $input);