This is a pretty straight-forward question. Within a program of mine, I have a string that's going to be used as a filename, but it might have some invalid characters in it that wouldn't be valid in a filename. If there are any invalid characters, I want to get rid of them and essentially squeeze the remaining characters together to form a valid filename.

I can't seem to find any string function that might help to assist in making this a more efficient than simply checking the string char by char, moving the valid chars into another string while ignoring the invalid ones, creating a valid filename.

Just thought I'd ask and see what kind of input I would receive. Thank you.