Extract file extension: Difference between revisions
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(→{{header|J}}: list of examples) |
(Emacs builtin file-name-extension) |
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} |
} |
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</lang> |
</lang> |
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=={{header|Emacs Lisp}}== |
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<lang Lisp>(file-name-extension "foo.txt") |
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=> |
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"txt"</lang> |
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No extension is distinguished from empty extension but an <code>(or ... "")</code> can give <code>""</code> for both if desired |
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<lang Lisp>(file-name-extension "foo.") => "" |
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(file-name-extension "foo") => nil</lang> |
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An Emacs backup <code>~</code> or <code>.~NUM~</code> are not part of the extension, but otherwise any characters are allowed. |
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<lang Lisp>(file-name-extension "foo.txt~") => "txt" |
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(file-name-extension "foo.txt.~1.234~") => "txt"</lang> |
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=={{header|Go}}== |
=={{header|Go}}== |
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file.resumé → "" (Standard: ".resumé") |
file.resumé → "" (Standard: ".resumé") |
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</pre> |
</pre> |
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=={{header|J}}== |
=={{header|J}}== |
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