• Replace one string with another (String replace) e.g. Replace ‘X’ with ‘Y’
• Remove instances of a string (String remove) e.g. Remove all instances of ‘X’
• Replace strings which match a regex rule with another string (Regex replace) e.g. Replace any numbers (^[0-9]{3}$) with ‘y’
• Remove strings which match a regex rule (Regex replace) e.g. Remove any numbers (^[0-9]{3}$)
• Prepend a string onto the front of a post (Prepend) e.g. Add ‘X’ to the top of a post
• Append a string onto the back of a post (Append) e.g. Add ‘X’ to the bottom of a post
• Add a post into a category (Add category) e.g. Add category ‘X’ to the post if its not already added.
• Add a tag onto a post (Add tag) e.g. Add tag ‘X’ to the post if its not already added.
• Change a posts date
• Change a posts status

(Taken from here.)