Using String.split with a regex

Question

...so I'm trying to split data using the split() method of string. (And by the way, I'm impressed with how well regular expressions have evolved in Java since I last bent code in a serious fashion.)

Here's what I'm trying, and it doesn't seem to give me results I would predict:

public static void main(String[] args){
    String s = "CSCO_9910290";

    String [] ss = s.split("(.*)_(.*)"); // split on the _ character
    System.out.println("Size of ss is: " + ss.length + "\n"); // this prints 0

    for (String r : ss ){
        System.out.println("result is: " + r + "\n");
    }
    System.out.println("Finished now..."); // declares completion of loop

}

rgettman · Accepted Answer · 2013-12-19 21:30:08Z

5

With the regular expression for split, the aim is not to create a regular expression for the entire string, but for matching the separator(s) only. You don't need anything but:

String [] ss = s.split("_");

answered Dec 19, 2013 at 21:30

rgettman

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1 Comment

agentv Over a year ago

...of course. Blame it on an aging Perl programmer. (not me of course, I'm never to blame.)

ashatte · Accepted Answer · 2013-12-19 21:33:07Z

1

String [] ss = s.split("_"); // split on the _ character

It is the correct way.

edited Dec 19, 2013 at 21:33

ashatte

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answered Dec 19, 2013 at 21:30

JosefN

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agentv Over a year ago

...actually, now that makes sense to me. I was working too hard.

Pshemo · Accepted Answer · 2013-12-19 21:33:29Z

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For splitting on the _ character simply use s.split("_")

edited Dec 19, 2013 at 21:33

Pshemo

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answered Dec 19, 2013 at 21:30

user3118604

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