Question

Let’s say I have a string like so:

“Lorem ipsum de color [post]57[/post]
sit amet [post]103[/post] desectator.”

I want to find all occurrences of [post]*[/post] and replace it with the title of the post represented by the number. I’d end up with something like so:

“Lorem ipsum de color Angry Turtle sit
amet Fuzzy Rabit desectator.”

I’m guessing a regex will be needed… looking for what the regex would be and how to use.

Answer 1

The gsub method on String has a handy block variation that works well here:

>> s = "Lorem ipsum de color [post]57[/post] sit amet [post]103[/post] desectator."
=> "Lorem ipsum de color [post]57[/post] sit amet [post]103[/post] desectator."

>> posts = {"57" => "Angry Turtle", "103" => "Fuzzy Rabit"}
=> {"57"=>"Angry Turtle", "103"=>"Fuzzy Rabit"}

>> s.gsub(/\[post\](\d+)\[\/post\]/) {|m| posts[$1] }
=> "Lorem ipsum de color Angry Turtle sit amet Fuzzy Rabit desectator."

Your syntax couldn’t be much less regex friendly though. Try not to use brackets and slashes.