Question

I want to replace my title from its default to "*number* new messages | default"

Here is the code I have, it changes from default to 1 new messages fine, but it never goes above 1.

title = $('title').text();
regexp = /^(\d+)/

if (title.match(regexp))
  $('title').text().replace(regexp, (parseInt("$1")+1).toString())
else
  $('title').text('1 New Messages | Default')

Answer 1

You should be using a function as the second argument to replace, you also need to set the new value:

var title = $('title').text();
$('title').text(title.replace(regexp, function(m) { return parseInt(m, 10) + 1) }));

And, as usual, don’t forget the radix argument when you call parseInt or you will be unpleasantly surprised sooner or later.