I am storing all articles for a website in text files. From there they are made into webpages according to my current template. Some of these contain strange characters which do not appear correctly when viewed. Double quotes (the curly ones) are shown as question marks. Pound signs (as in £ - I am from the UK) are shown oddly. Its a text encoding question. This is especially the case with people writing on apples as they seem to use a different sets of quotes (curly quotes not straight ones).
What I want to do is to detect these rogue characters and then convert them to ones handled better.