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Regex for a file name without an extension – Stack Overflow

Posted by jpluimers on 2021/06/30

For me this unaccepted answer from [WayBack] Regex for a file name without an extension – Stack Overflow by [WayBack] Bohemian worked best:

Assuming the extensions are up to 4 chars in length (so filenames like mr.smith aren’t considered as having an extension, but mr.smith.doc and mr.smith.html are considered as having extensions):

^.*[^.]{5}$

No need to capture a group, as the whole expression is what you want – ie group 0.

Depending on the extension length, increase 5 to like 7 for 6 character extensions (it’s always N+1 when you want to match extensions of N characters).

–jeroen

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