This function allows you to extract tags from a file's name. If your file names follow a certain pattern, you can enter that pattern into this function and Metadatics will populate the appropriate tags. In the example below, the file names all follow the pattern Track Number, period, space, Track Title. That pattern is entered into the File Name Format String field.
File Name Format String - The pattern that the file names use. You can also separate folders using a forward-slash. So if all of your files are in a folder and the folder's name is the album artist, you could enter: {ALBUMARTIST}/{TRACKNUMBER}. {TRACKTITLE}
Remove Leading Zeros From Disc & Track Numbers - When enabled, any zeros will be removed at the beginning of Disc Number, Disc Total, Track Number, and Track Total tags. e.g: 01 will become 1.
Use Regular Expressions - Allows you to use regular expressions in your format string. I would recommend seeing http://www.regular-expressions.info/ for more information about regular expressions.
Apply To - Allows you to choose if you want to apply this function to all files or only the selected files.
Preview - When you turn on Preview Mode, you will see what the results of this function are going to be. The results will be shown in red text.
Use the "Insert Format Specifier" pull-down to insert common tags. You can also enclose the name of any tag in brackets by typing it in yourself.