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How do I search for filenames that contain a "." such as 321.133.pdf, etc.?

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If you want to search for files with a period '.' in the name you could simply search for '.', e.g.

File name: .

However, since most files have a '.' in the name to separate the name from the extension you probably want to search for files with more than one period, to do that search for '.*.', e.g.

File name: .*.
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