What is the meaning of the 'g' flag in regular expressions?

Question

What is the meaning of the g flag in regular expressions?

What is is the difference between /.+/g and /.+/?

Answer 1

Example in Javascript to explain:

> 'aaa'.match(/a/g)
[ 'a', 'a', 'a' ]

> 'aaa'.match(/a/)
[ 'a', index: 0, input: 'aaa' ]