Javascript case-insensitive matching and replacing?

Question

Basically, I need to be able to find certain words (by 'word' I mean a set of characters) in a string (case insensitive) and if they match, I need to insert a symbol after the first letter of that particular set of characters. I can't use search replace, as that would not preserve the case.

Example:

Brown brownies are in an oven.

If the word I'm looking for is brown, and the character I want to insert is *, the result should be:

B*rown b*rownies are in an oven.

What is the best way to do so in JS?

Answer 1

Regex with option 'ig' does the trick.

"Brown brownies are in an oven.".replace(/(b)(rown)/gi, "$1*$2")