Template:File extension

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Outputs the file extension of the filename indicated by parameter {{{1}}}. In the File: namespace, this parameter defaults to {{PAGENAME}}. In all other namespaces, the default output is an empty string. Any uppercase letters in the file extension are changed to lowercase.

Usage

Input	Output	Notes
{{file extension}}		(empty string output because current page is in the Template: namespace)
{{file extension|Makefile}}		(empty string output because specified filename has no extension)
{{file extension|I-35.svg}}	svg	Input filename is acceptable with or without File: namespace prefix.
{{file extension|File:George H. Sharpe.jpg}}	jpg
{{file extension|UNMSM logo1.PNG}}	png	Uppercase is changed to lowercase
{{file extension|Wikimedia Logo.jpeg}}	jpeg	jpeg is not changed to jpg

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