JS replace not working on string [duplicate]

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.replace() returns a new string (it does not modify the existing string) so you would need:

answer_form = answer_form.replace(/#/g, question_num);

You probably should also make question_num a string though auto type conversions probably handle that for you.

Working example: http://jsfiddle.net/jfriend00/4cAz5/

FYI, in Javascript, strings are immutable – an existing string is never modified. So any method which makes a modification to the string (like concat, replace, slice, substr, substring, toLowerCase, toUpperCase, etc…) ALWAYS returns a new string.

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