/g option to show multiple matches on a single line.
When we talk of Rubular and Scriptular, we'll often say that a regex highlights or lights up a particular string or strings. This shorthand is another way of saying that Rubular or Scriptular highlight the indicated items when it applies a regex to some test data.
With this basic information out of the way, you are now ready to make your first dive into the world of regex. Enjoy!