While executing a below command in linux
[email protected]:~# cat /etct/user.conf
I will get following data.
[General]
ui_language=US_en
From this i need to fetch the value of ui_language (US_en) only using regular expression.
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you can do this using pattern and matcher class.sandip bharadva– sandip bharadva2018-12-07 04:25:40 +00:00Commented Dec 7, 2018 at 4:25
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@divz Which programming language are you using to code?Vishnudev Krishnadas– Vishnudev Krishnadas2018-12-07 04:33:56 +00:00Commented Dec 7, 2018 at 4:33
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java lag is usingdivz– divz2018-12-07 04:34:34 +00:00Commented Dec 7, 2018 at 4:34
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2 Answers
You can pipe to grep and sed:
cat foo.txt | grep 'ui_language=' | sed 's/ui_language=\(.*\)/\1/g'
Replace foo.txt with your file name.
Example:
host$ cat foo.txt
[General]
ui_language=US_en
host$ cat foo.txt | grep 'ui_language=' | sed 's/ui_language=\(.*\)/\1/g'
US_en
host$
EDIT: I didn't realize you wanted to use java. This was not originally tagged with java. You can do that with the following:
MatchExample.java
import java.util.regex.*;
import java.io.File;
import java.nio.file.Files;
public class MatchExample {
public static void main(String[] args) throws Exception {
byte[] bytes = Files.readAllBytes((new File(args[0])).toPath());
String s = new String(bytes,"UTF-8");
Pattern pattern = Pattern.compile("ui_language=(.*)");
Matcher matcher = pattern.matcher(s);
if (matcher.find()){
System.out.println(matcher.group(1));
}
}
}
This takes filename as the first parameter.
Compile:
host$ javac MatchExample.java
Run:
host$ java MatchExample foo.txt
US_en
host$
Comments
Pattern pattern = Pattern.compile("US_en");
Matcher matcher = pattern.matcher(mydata);
if (matcher.find()){
System.out.println(matcher.group(1));
}
here,mydata is a string from which you want to fetch data
3 Comments
divz
one thing is the value of ui_language= may varies..some times its value will be US_es or so one...
sandip bharadva
store that string in one variable then pass that variable in pattern class compile method.
divz
But we cant predict what langs are coming