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 the search to be case insensitive

so say the needle is "cow" and the haystack is

cows at www.cows.com, milk some COWS

would turn into

<b>cows</b> at www.cows.com, milk some <b>COWS</b>

also keywords should be able to have spaces in it so if the keyword is "who is mgmt"...

great band. who is mgmt btw? 

would turn into

great band. <b>who is mgmt</b> btw? 

Thanks

Answer 1

For those who don't want SPACE as the delimiter, simply don't use \s.

function updateHaystack(input, needle) 
{
 return input.replace(new RegExp('(^|)(' + needle + ')(|$)','ig'), '$1<b>$2</b>$3');
}

Worked for me.