n8kowald

Your redirect is correct. Must be something else.

1. Do any of your redirects with this plugin work? Your non-regular expression ones?
2. Do you have access to your PHP error log? The problem might be reported in there.
   https://stackoverflow.com/a/4764452
3. In ‘Tools > Redirection > Modules’, if you’re using .htaccess Apache redirects, try temporarily disabling them and using the WordPress module instead

Looks like you’ve tried this already but if not, try a non-regular expression redirect on:
/_blog/Inside_Flowers/post/Online_Marketing_for_Florists_Part_1_%E2%80%93_A_Website_You_Won%27t_Regret/

If this works and you need to find URLs for the other 404 pages you can use Chrome’s Dev Tools: (F12) > Network > (reload page).
Click the first item in the list and in the right hand side you can copy the ‘Request URL’: https://i.imgur.com/zoMJn73.png

I tested your redirects in my website and both work for me.
Have you checked the ‘Regular expression‘ checkbox?
This is required otherwise the ‘Source URL’ is taken literally.
Sorry, I forgot to say this in my original answer.

Here’s a screenshot of my working redirect: https://i.imgur.com/YeDt6OY.png

I ran into this problem today and saw the following in the documentation:
/tags/(.*?)-(.*?) => /tags/$1%20$2 <– replaces hyphens with spaces.

A fix is to use a dot-star grouping, followed by the character you want to exclude, followed by another dot-star grouping.

This should work for you:
Source URL: /_blog/Inside_Flowers/post/(.*)(\%E2\%80\%99|')(.*)
Target URL: https://www.tesselaars.com/online-marketing-for-florists/

The second group (\%E2\%80\%99|') handles apostrophes encoded like %E2%80%99 and '.