How to extract a particular string from a String variable

Question

I am getting a string which contains the name of the file along woth extension for ex as shown below..

 String s = "abcdf.dat";// Now as shown file abcde having a .dat extension

Now i want to store the file name only in another string but not the extension so I want to store in this format such as-

 String p= "abcdf"; //only file name please advise how to achieve this

This code does not even compile (unless `abcdf` is an object of a class that has a public field called `dat`). — Sergey Kalinichenko, Aug 31 '13 at 08:08
Duplicate of http://stackoverflow.com/questions/941272/how-do-i-trim-a-file-extension-from-a-string-in-java?lq=1 — bsd, Aug 31 '13 at 08:16
@dasblinkenlight OP might forgot to write `String s = "abcdf.dat";` — Suresh Atta, Aug 31 '13 at 08:16

score 1 · Answer 1 · 2013-08-31T08:14:26.130

1

You can use split(String regex) to get the name.

String fileName = "abcdf.dat";
String name = fileName.split("\\.")[0]; // abcdf
String ext = fileName.split("\\.")[1]; // dat

NOTE: "\\." is a regular expression.

edited Aug 31 '13 at 08:14

answered Aug 31 '13 at 08:07

3

This won't work, since `.` has to be escaped. – Konstantin Yovkov Aug 31 '13 at 08:10

score 1 · Answer 2 · answered Aug 31 '13 at 08:09

1

Use String#split() method.

String abcdf = "abcdf.dat";
String result= abcdf.split("\\.")[0];

. is a meta character ,So you need to escape it before splitting.

answered Aug 31 '13 at 08:09

Suresh Atta

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T_V · Answer 3 · 2013-08-31T08:26:01.317

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You can use-

String filename = s.substring(0, s.lastIndexOf("."));

Since File name can contain more than one dot (.) so till last dot would be the file name.

edited Aug 31 '13 at 08:26

answered Aug 31 '13 at 08:13

T_V

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How about "filename.tar.gz" ? – bsd Aug 31 '13 at 08:38
@bsd these(.tar.gz or .9.png etc) are exceptional case you can keep check for it pragmatically. – T_V Aug 31 '13 at 08:40
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@TarunDroid We can't cover all the aspects here.We give some hints,Help to resolve some Logical mistakes etc.. – Suresh Atta Aug 31 '13 at 09:20

score 0 · Answer 4 · edited Aug 31 '13 at 08:31

0

String s = "abcdf.dat";

String start = StringUtils.substringBefore(s, "."); // returns "abcdf"

edited Aug 31 '13 at 08:31

Pshemo

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answered Aug 31 '13 at 08:13

Abdul Rehman Janjua

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What if file name have more than one dot like `some.file.doc`? – Pshemo Aug 31 '13 at 08:32

score 0 · Answer 5 · answered Aug 31 '13 at 08:18

0

String p = s.substring(0, s.lastIndexOf("."));

answered Aug 31 '13 at 08:18

Michael Yaworski

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score 0 · Answer 6 · answered Aug 31 '13 at 08:27

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Try this one

 String fileName = "abcdf.dat";

 String name = fileName.split(java.util.regex.Pattern.quote("."))[0];
 String ext = fileName.split(java.util.regex.Pattern.quote("."))[1];

answered Aug 31 '13 at 08:27

Prabhakaran Ramaswamy

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How to extract a particular string from a String variable

6 Answers6