Extract file extension: Difference between revisions
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(file-name-extension "foo.txt.~1.234~") => "txt"</lang> |
(file-name-extension "foo.txt.~1.234~") => "txt"</lang> |
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=={{header|Forth}}== |
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<lang forth>: invalid? ( c -- f ) |
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toupper dup [char] A [char] Z 1+ within |
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swap [char] 0 [char] 9 1+ within or 0= ; |
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: extension ( addr1 u1 -- addr2 u2 ) |
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dup 0= if exit then |
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2dup over + |
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begin 1- 2dup <= while dup c@ invalid? until then |
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\ no '.' found |
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2dup - 0> if 2drop dup /string exit then |
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\ invalid char |
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dup c@ [char] . <> if 2drop dup /string exit then |
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swap - |
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\ '.' is last char |
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2dup 1+ = if drop dup then |
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/string ; |
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: type.quoted ( addr u -- ) |
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[char] ' emit type [char] ' emit ; |
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: test ( addr u -- ) |
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2dup type.quoted ." => " extension type.quoted cr ; |
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: tests |
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s" picture.jpg" test |
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s" http://mywebsite.com/picture/image.png" test |
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s" myuniquefile.longextension" test |
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s" IAmAFileWithoutExtension" test |
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s" /path/to.my/file" test |
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s" file.odd_one" test |
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s" IDontHaveAnExtension." test ;</lang> |
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{{out}} |
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<pre>cr tests |
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'picture.jpg' => '.jpg' |
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'http://mywebsite.com/picture/image.png' => '.png' |
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'myuniquefile.longextension' => '.longextension' |
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'IAmAFileWithoutExtension' => '' |
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'/path/to.my/file' => '' |
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'file.odd_one' => '' |
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'IDontHaveAnExtension.' => '' |
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ok</pre> |
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=={{header|Go}}== |
=={{header|Go}}== |
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<lang go>package main |
<lang go>package main |
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