An oddly-worded replacement effect

In Magic, replacement effects are very recognizable because they typically use the word "instead". In fact, the vast majority of them conform to the template:

"If (something) would (do something), (do something else) instead."

For example, Rest in Peace says:

"If a card or token would be put into a graveyard from anywhere, exile it instead."

This form is so ubiquitous that when one gets used to it, a card like Knight of the Holy Nimbus sounds very strange.

It says: "If Knight of the Holy Nimbus would be destroyed, regenerate it."

Note how it almost conforms to the standard template, except that it does not use the word "instead". In fact, it doesn't seem to conform to any standard template for replacement effects. These templates are defined in rule 614.1, and are (paraphrasing):

• Effects that use the word "instead".
• Effects that use the word "skip".
• Effects that read "[This permanent] enters the battlefield with ...", "As [this permanent] enters the battlefield ...", or "[This permanent] enters the battlefield as ..."
• Effects that read "As [this permanent] is turned face up ..."

None of those templates seem to fit Knight of the Holy Nimbus. So what exactly is it?

It turns out that this is a special wording defined in rule 701.12b. Said rule effectively states that

"If [this permanent] would be destroyed, regenerate it."

means

"If [this permanent] would be destroyed, instead remove all damage marked on it and tap it, and if it's an attacking or blocking creature, remove it from combat."

The "instead" is implied in this particular template.