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I have a regular expression that strips everything but letters. numbers, and periods. How do I also add foreslashes to it?
$targetFile = preg_replace('/[^A-Za-z0-9-.]/', '', $targetFileDirty);
You can escape the foreslash by putting a backslash before it –
$targetFile = preg_replace('/[^A-Za-z0-9-.\/]/', '', $targetFileDirty);Alternatively, and perhaps better, you can use different delimiters instead, e.g.
$targetFile = preg_replace('#[^A-Za-z0-9-./]#', '', $targetFileDirty);