Java split string by "^|^"

Question

I have a sample data following:

***^|^100^|^101^|^102^|^103^|^104^|^

I wish to split by "^|^" so the result will be:

Below is my sample code, but failed to obtain expected result,am i misunderstood the split pattern?

String a = "***^|^100^|^101^|^102^|^103^|^104^|^105^|^106^|^107^|^108^|^";
String [] split ;

split = a.split("^|^");
for(int i=0; i<split.length; i++)
{
        System.out.println(split[i]);
}

http://stackoverflow.com/questions/21524642/splitting-string-with-pipe-character — Sotirios Delimanolis, Nov 13 '15 at 07:03

score 12 · Accepted Answer · answered Nov 13 '15 at 06:03

12

Both ^ and | are special-chatacters you need to escape them.

split = a.split("\\^\\|\\^");

answered Nov 13 '15 at 06:03

Uma Kanth

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score 12 · Answer 2 · answered Nov 13 '15 at 06:05

12

Use Pattern.quote() to treat all meta characters as String literals / Literal pattern. ^ , | have special meaning in regex.

This should work :

public static void main(String[] args) throws Exception {
    String s = "***^|^100^|^101^|^102^|^103^|^104^|^";
    String pattern = Pattern.quote("^|^");
    System.out.println(Arrays.toString(s.split(pattern)));

}

O/P :

[***, 100, 101, 102, 103, 104]

answered Nov 13 '15 at 06:05

TheLostMind

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1

I had no idea about Pattern. Thanks looks awesome. – Michael Queue Nov 13 '15 at 06:06
2

That looks much nicer than the usual backslash frenzy. Still, I wished there was a split method that takes a separator string, not a regex. – Thilo Nov 13 '15 at 06:07
@Thilo - Ya. That would have made things much simpler :) – TheLostMind Nov 13 '15 at 06:08
1

and if you use that same pattern in more than one place, you can declare it once for all to use `public static final Pattern HAT_PIPE_HAT = Pattern.quote("^|^")` – Thilo Nov 13 '15 at 06:10
1

@Thilo - `Pattern.quote()` returns a `String`. But Yes, you are right, creation of Patterns is costly :) – TheLostMind Nov 13 '15 at 06:14
2

I was thinking more about readibility. I don't think it's that costly. But one could take it one step further and do `static final Pattern HAT_PIPE_HAT = Pattern.compile(Pattern.quote("^|^"))` which gives `HAT_PIPE_HAT.split(theString)`. – Thilo Nov 13 '15 at 07:05
@Thilo - Yep. Making patterns `static` and `final` improve readability as well as *reusability* :) – TheLostMind Nov 13 '15 at 07:51

score -2 · Answer 3 · answered Nov 13 '15 at 06:08

-2

Please check this

String str = "***^|^100^|^101^|^102^|^103^|^104^|^";
String arr[] = str.split("\\^\\|\\^");
System.out.println(arr.length);

answered Nov 13 '15 at 06:08

Ashish Agrawal

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what's different in this answer from Uma? – bobble bubble Nov 13 '15 at 06:11

Java split string by "^|^"

3 Answers3