Extract file extension: Difference between revisions
Add ed example
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</syntaxhighlight>
=={{header|Ed}}==
Prints empty line for extension-less/extension-invalid names.
<syntaxhighlight>
H
,p
g/.*/s/^.*(\.[[:alnum:]]+)$/\1/g
v/^\.[[:alnum:]]+$/s/.*//
,p
Q
</syntaxhighlight>
{{out}}
<pre>$ cat extension.ed | ed -E extension.input
Newline appended
109
http://example.com/download.tar.gz
CharacterModel.3DS
.desktop
document
document.txt_backup
/etc/pam.d/login
.gz
.3DS
.desktop
?
Warning: buffer modified</pre>
=={{header|Emacs Lisp}}==
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