Javascript character replace all

You're almost there.

the thing you saw in SO is regex replace :

document.write(test.replace(/\?/g,"&")) ( I thought you wanted to change & to ? , but you want the opposite.)

with the G flag - it will replace all the matches in the string

without it - it will replace only the first match.

You need to escape the ? character like so:

test.replace(/\?/g,"&")