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JAVA Regex Pattern for XML Gregorian Calender

Posted on 2014-04-17
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Last Modified: 2014-04-17
I have to read file that has text as "#EXT-X-PROGRAM-DATE-TIME:2014-04-17T07:18:02.350+00:00" for every 10 seconds and ill be having such files about 400.

I need to fetch value 2014-04-17T07:18:02.350+00:00

I did a sample program that picks the above value with  substring.

 String aacKey = strLine.substring(strLine.indexOf(#EXT-X-PROGRAM-DATE-TIME:) + 5, strLine.length() - 1);

However, this looks like a costly approach where i see char[] is taking too much of heap space where allocated space isn't enough for the operations.

What is the best approach to address this. Also, what is the regular expression that i can use to fetch using Pattern, Matcher instead of substring().

Appreciate your response.
Thanks :)
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Question by:VAnvesh
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5 Comments
 
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Expert Comment

by:käµfm³d 👽
ID: 40007828
what is the regular expression that i can use
String pattern = "\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d+\\d{2}:\\d{2}";

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Author Comment

by:VAnvesh
ID: 40007876
Hi Kaufmed,

I understand the expression and i believe it is correct. However, when i used for the below program
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringRegex {

    public static void main(String [] a){
        String value = "#EXT-X-PROGRAM-DATE-TIME:2014-04-17T07:18:02.350+00:00";
        Pattern p = Pattern.compile("\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d+\\d{2}:\\d{2}");
        Matcher m = p.matcher(value);
        if(m.find())
        System.out.println(m.group(1));
    }
}

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I am unable to get the desired result. Can you let me know where i go wrong.
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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 40007893
Try group 0 instead--I didn't include any capture groups in the pattern. Or, you can surround the pattern with parens (see below) and you can stick with group 1.

Pattern p = Pattern.compile("(\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d+\\d{2}:\\d{2})");

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LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 500 total points
ID: 40007908
P.S.

I forgot to include one character:

Pattern p = Pattern.compile("(\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d+\\+\\d{2}:\\d{2})");

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Forgot the +
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Author Closing Comment

by:VAnvesh
ID: 40007970
solution works flawless. Thanks to Kaufmed.
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