Javascript regular expressions

Let's start with an arbitrary string:

Now modify it replacing the occurrences of a regular expression:

The regexp /([nt])a\b/gi matches every word tail composed by a 'n' or a 't' followed by a 'a'; the String function member replace substitutes the 'a' in those occurrences with a 'o'.

Now if we have:

And we want to surround all numbers with round brackets, we will replace every occurrence of /([\d\.]+)/g, obtaining: