title: Replace all non-alphanumeric characters in a string
body: <p>I have a string with which i want to replace any character that isn't a standard character or number such as (a-z or 0-9) with an asterisk. For example, "h^&amp;ell`.,|o w]{+orld" is replaced with "h*ell*o*w*orld". Note that multiple characters such as "^&amp;" get replaced with one asterisk. How would I go about doing this?</p>