split UUID in group of 3 characters

I need to extract the first 9 characters of my UUID, and then split them into group of 3.

For integer id I am doing something like that

 String[] arr = String.format ("%09d", id).split("(?<=\\G.{3})");

Converting the integer id into 9 characters and then splitting it in the group of 3.

How to get the first 9 characters of UUID and then split it in groups of 3

To get first 9 characters of your String, you can try a code like this:

String firstNineChars = s.substring(0, Math.min(s.length(), 9));

And then just directly split the String, firstNineChars like this:

String first = firstNineChars.substring(0,3);
String second = firstNineChars.substring(3,6);
String third = firstNineChars.substring(6,9);

Information and Communication Technology for Sustainable , Fig. 3 LoRaWAN architecture UUID—This universally unique identifier (UUID) which is further split into five groups contains hyphens between them. It is a character set of 16 hexadecimal digits which is splitted into five sections of groups with a hyphen in It is used to group the beacon that has the same proximity UUID. Let’s use the blkid utility to find out information about our block device (hard disk sdb1 in this case) and extract the UUID from it. Here are two (of many various) possible options to do that. This recognizes UUID only of “a81b3762-5c4d-4519-a7e3-2f12983d30d4” style:

UUID has format 1957afac-f1c2-4da7-9151-249a3fa742be, so the first group is 1957afac. And you want to get is with group of 3: [195, 7af, ac].

You can treat it as simple string with known reguired number positions, so you do not need to find a first - to split a first group:

public static String[] getFirstGroup(String uuid) {
    return new String[] { uuid.substring(0, 3), uuid.substring(3, 6), uuid.substring(6, 8) };
}

public static String[] getFirstGroup(UUID uuid) {
    return getFirstGroup(uuid.toString());
}

In case you need e.g. 2nd group, then obvious way is to find '-' and find a substring. But if you look at UUID.toString():

public String toString() {
    return (digits(mostSigBits >> 32, 8) + "-" +
            digits(mostSigBits >> 16, 4) + "-" +
            digits(mostSigBits, 4) + "-" +
            digits(leastSigBits >> 48, 4) + "-" +
            digits(leastSigBits, 12));
}

you could see, that using digits method (this is private static, but you could copyt these one line method) you could easily find required group without parse a string.

Optimization for Control, Observation and Safety, It splits the full dataset into training and test data folds, measures the trained model's contexts depend on and vary with characters of manufacturing systems (e.g., Metadata of model = {UUID, Group ID, Creator, Source, Means, Creation, (1) model substitution, (2) model validation, and (3) model storage and retrieval​. uuid — UUID objects according to RFC 4122¶ This module provides immutable UUID objects (the UUID class) and the functions uuid1(), uuid3(), uuid4(), uuid5() for generating version 1, 3, 4, and 5 UUIDs as specified in RFC 4122. If all you want is a unique ID, you should probably call uuid1() or uuid4().

For the standard Java UUID class, simply clean up the string of '-' characters and cut of the first 9 remaining characters. Then you regex will work the same way.

If you want the first 9 characters from the left (first, the way humans read), use this code:

String [] arr = id.toString().replaceAll("-", "").substring(0, 9).split("(?<=\\G.{3})");

If you want the first 9 from the right (representing LSB), you will need an extra step:

String str = id.toString().replaceAll("-", "");
String [] arr = str.substring(str.lenght() - 9).split("(?<=\\G.{3})");

Universally unique identifier, A universally unique identifier (UUID) is a 128-bit number used to identify information in The four bits of digit M are the UUID version, and the 1 to 3 most significant RFC 4122 Section 3 requires that the characters be generated in lower case, local-domain numbers 0 and 1 are for user ids (UIDs) and group ids (GIDs)  Given a string (be it either string of numbers or characters), write a Python program to split the string by every n th character. Examples: Input : str = "Geeksforgeeks", n = 3 Output : ['Gee', 'ksf', 'oor', 'gee', 'ks'] Input : str = "1234567891234567", n = 4 Output : [1234, 5678, 9123, 4567]

This worked for me

String itemID = item_id.toString();
String upToNCharacters[] = itemID.substring(0, Math.min(itemID.length(), 9)).split("(?<=\\G.{3})");;
String UUIDAsString = StringUtils.join(Arrays.asList(upToNCharacters),"/");

The Python 3 Standard Library by Example: Pyth 3 Stan Libr Exam _2, Random values, UUID 4, 802 randrange() function, random integers, 257 15 constraining search, 28–29 dissecting matches with groups, 30–36 finding 48–​53 splitting with patterns, 55–57 translating patterns in fnmatch, 325–326 re module, pattern syntax anchoring, 26–27 character sets, 20–23 escape codes, 23–26  UUID has format 1957afac-f1c2-4da7-9151-249a3fa742be, so the first group is 1957afac.And you want to get is with group of 3: [195, 7af, ac]. You can treat it as simple string with known reguired number positions, so you do not need to find a first -to split a first group:

UUIDs are Popular, but Bad for Performance, This yields the 64 bits of the first 3 groups. A UUID value consists of 16 bytes of data, if we divide by 3, there is a remainder of 1. The first four characters of the UUID value comes from the MD5 hash of the concatenation of  Splitting a string into groups of three characters. Python Forums on Bytes.

20.15. uuid — UUID objects according to RFC 4122, This module provides immutable UUID objects (the UUID class) and the functions uuid1() , uuid3() , uuid4() , uuid5() for generating version 1, 3, 4, and 5 UUIDs as specified in RFC 4122. The UUID as a 32-character hexadecimal string. It contains 32 hexadecimal digits, split into 5 groups, separated by hyphens and should look something like this: f7826da6-4fa2-4e98-8024-bc5b71e0893e - Kontakt.io default UUID Each of the 5 groups must contain the following number of characters per section:

Complete guide to Universal Unique Identifiers (UUID), UUIDs are 36 character strings containing numbers, letters and dashes. UUIDs UUIDs are written in 5 groups of hexadecimal digits separated by hyphens. With version-3 and version-5, the UUID output is based on the input you provide. String UUID. 05/31/2018; 2 minutes to read; In this article. A string UUID contains the character-array representation of a UUID. A string UUID is composed of multiple fields of hexadecimal characters. Each member has a fixed length, and fields are separated by the hyphen character. For example: 989C6E5C-2CC1-11CA-A044-08002B1BB4F5

Comments
  • So, is there anything going wrong?
  • I can't do the same for UUID string
  • can you give an example code where it doesn't work?
  • Hey @summu did you try my answer? Did it help you solve your problem?
  • Hey @PradymanDixit, I have posted my answer, You were right in the first part, as for grouping part I need to join it as group separated by '/' Check my answer
  • @summu nice, do vote up the answer, or mark it as correct, if you think it can solve other person's problem, I'd appreciate that. Cheers! :)
  • yea sure, upvote my question also so others find it useful