Asked  10 Months ago    Answers:  5   Viewed   8 times

I have this string 8S8Q4D1SKCQC2C4S6H4C6DJS2S1C6C

How can I split this string into substrings that consist of 2 characters per substring? I'm confused because I cannot find a delimiter to split them.

 Answers

3
System.out.println(Arrays.toString(
    "8S8Q4D1SKCQC2C4S6H4C6DJS2S1C6C".split("(?<=\G.{2})")
));
Wednesday, August 4, 2021
 
3

split(delimiter) by default removes trailing empty strings from result array. To turn this mechanism off we need to use overloaded version of split(delimiter, limit) with limit set to negative value like

String[] split = data.split("\|", -1);

Little more details:
split(regex) internally returns result of split(regex, 0) and in documentation of this method you can find (emphasis mine)

The limit parameter controls the number of times the pattern is applied and therefore affects the length of the resulting array.

If the limit n is greater than zero then the pattern will be applied at most n - 1 times, the array's length will be no greater than n, and the array's last entry will contain all input beyond the last matched delimiter.

If n is non-positive then the pattern will be applied as many times as possible and the array can have any length.

If n is zero then the pattern will be applied as many times as possible, the array can have any length, and trailing empty strings will be discarded.

Exception:

It is worth mentioning that removing trailing empty string makes sense only if such empty strings ware created by split mechanism. So for "".split(anything) since we can't split "" farther we will get as result [""] array.
It happens because split didn't happen here, so "" despite being empty and trailing represents original string, not empty string which was created by splitting process.

Tuesday, June 1, 2021
 
jsuissa
 
1
"cat".split("(?!^)")

This will produce

array ["c", "a", "t"]

Tuesday, June 1, 2021
4

use str.split("n", -1) (with a negative limit argument). When split is given zero or no limit argument it discards trailing empty fields, and when it's given a positive limit argument it limits the number of fields to that number, but a negative limit means to allow any number of fields and not discard trailing empty fields. This is documented here and the behavior is taken from Perl.

Monday, June 14, 2021
 
tadman
 
2

String#split takes a second argument, the limit.

str.split(' ', 2)

should do the trick.

Tuesday, August 10, 2021
 
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