Javascript Regex: How to bold specific words with regex?

Question

Given a needle and a haystack... I want to put bold tags around the needle. So what regex expression would I use with replace()? I want SPACE to be the delimeter and I want

Answer 1

findstring: /(^|\s)(cows)(\s|$)/ig
newstring: '$1$2$3'

The \b markers are for "word boundaries"; the /ig flags are for case-ignoring and global matching, respectively.

The usage of the () captures and then $1/$2/$3 in the new string text is so that the capitalization and spacing of whatever was matched will be preserved.