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Extract file extension: Difference between revisions

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Extract file extension (view source)

Revision as of 03:55, 11 May 2023

46 bytes removed ,  1 year ago
→‎{{header|Java}}
m (→‎{{header|C++}}: Fixed formatting and code output)
Line 1,385:
 
=={{header|Java}}==
<syntaxhighlight lang="java">public class Test {
import java.io.File;
}</syntaxhighlight>▼
public static void main(String[] args) {▼
<syntaxhighlight lang="java">
String[] filenames = { "http://example.com/download.tar.gz",▼
▲ public static void main(String[] args) {
"CharacterModel.3DS",
String[] strings = {
".desktop",
▲ String[] filenames = { "http://example.com/download.tar.gz",
"document",
"documentCharacterModel.txt_backup3DS",
"/etc/pam.d/logindesktop",
};"document",
"document.txt_backup -> null",▼
"/etc/pam.d/login -> null</pre>",▼
};▼
for (String string : strings)
System.out.println(extractExtension(string));
}
 
static String for extractExtension(String filename : filenamesstring) {
/* we can use the 'File' class to Stringextract extthe =file-name "null";*/
File file = new File(string);
int idx = filename.lastIndexOf('.');
String filename = file.getName();
if (idx != -1) {▼
int String tmpindexOf = filename.substringlastIndexOf(idx'.');
▲ if (idxindexOf != -1) {
if (tmp.matches("\\.[a-zA-Z0-9]+")) {▼
String extextension = tmpfilename.substring(indexOf);
/* and use a regex to match only }valid extensions */
▲ if (tmpextension.matches("\\.[aA-zAZa-Z0-9z\\d]+")) {
}
System.out.println(filenamereturn + " -> " + ext)extension;
▲ }
}
return "";
▲}</syntaxhighlight>
}
</syntaxhighlight>
{{Out}}
<pre>
<pre>http://example.com/download.tar.gz -> .gz
.gz
CharacterModel.3DS -> .3DS
.3DS
.desktop -> .desktop
.desktop
document -> null
 
▲document.txt_backup -> null
 
▲/etc/pam.d/login -> null</pre>
</pre>
 
=={{header|javascript}}==
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