Why do i need to add /g when using string replace in Javascript?

Question

Why is the \'/g\' required when using string replace in JavaScript?

e.g. var myString = myString.replace(/%0D%0A/g,\"
\");

Answer 1

It isn't required, but by default string.replace in JavaScript will only replace the first matching value it finds. Adding the /g will mean that all of the matching values are replaced.