I have tried to split a string using split method, but I'm facing some problem in using split method.
String str="1-DRYBEANS,2-PLAINRICE,3-COLDCEREAL,4-HOTCEREAL,51-ASSORTEDETHNIC,GOURMET&SPECIALTY";
List<String> zoneArray = new ArrayList<>(Arrays.asList(zoneDescTemp.split(",")));
Actual output :
zoneArray = {"1-DRYBEANS","2-PLAINRICE","3-COLDCEREAL","4-HOTCEREAL","51-ASSORTEDETHNIC","GOURMET&SPECIALTY"}
Expected output :
zoneArray = {"1-DRYBEANS","2-PLAINRICE","3-COLDCEREAL","4-HOTCEREAL","51-ASSORTEDETHNIC,GOURMET&SPECIALTY"}
Any help would be appreciated.
Use split(",(?=[0-9])")
You are not just splitting by comma, but splitting by comma only if it is followed by a digit from 0-9. This is also known as positive lookahead (?=).
Take a look at this code snippet for example:
public static void main(String[] args) {
String str="1-DRYBEANS,2-PLAINRICE,3-COLDCEREAL,4-HOTCEREAL,51-ASSORTEDETHNIC,GOURMET&SPECIALTY";
String[] array1= str.split(",(?=[0-9])");
for (String temp: array1){
System.out.println(temp);
}
}
}
Use a look-ahead within your regex, one that uses comma (not in the look-ahead), followed by a number (in the look-head). \\d+ will suffice for number. The regex can look like:
String regex = ",(?=\\d+)";
For example:
public class Foo {
public static void main(String[] args) {
String str = "1-DRYBEANS,2-PLAINRICE,3-COLDCEREAL,4-HOTCEREAL,51-ASSORTEDETHNIC,GOURMET&SPECIALTY";
String regex = ",(?=\\d+)";
String[] tokens = str.split(regex);
for (String item : tokens) {
System.out.println(item);
}
}
}
what this does is split on a comma that is followed by numbers, but does not remove from the output, the numbers since they are part of the look-ahead.
For more on look-ahead, look-behind and look-around, please check out this relevant tutorial page.
I want to check for pattern matching, and if the pattern matches, then I wanted to replace those text matches with the element in the test array at the given index.
public class test {
public static void main(String[] args) {
String[] test={"one","two","three","four"}
Pattern pattern = Pattern.compile("\\$(\\d)+");
String text="{\"test1\":\"$1\",\"test2\":\"$5\",\"test3\":\"$3\",\"test4\":\"$4\"}";
Matcher matcher = pattern.matcher(text);
while(matcher.find()) {
System.out.println(matcher.groupCount());
System.out.println(matcher.replaceAll("test"));
}
System.out.println(text);
}
}
I want the end result text string to be in this format:
{\"test1\":\"one\",\"test2\":\"$two\",\"test3\":\"three\",\"test4\":\"four\"}
but the while loop is exiting after one match and "test" is replaced everywhere like this:
{"test1":"test","test2":"test","test3":"test","test4":"test"}
Using the below code I got the result:
public class test {
public static void main(String[] args) {
String[] test={"one","two","three","four"};
Pattern pattern = Pattern.compile("\\$(\\d)+");
String text="{\"test1\":\"$1\",\"test2\":\"$2\",\"test3\":\"$3\",\"test4\":\"$4\"}";
Matcher m = pattern.matcher(text);
StringBuffer sb = new StringBuffer();
while (m.find()) {
m.appendReplacement(sb, test[Integer.parseInt(m.group(1)) - 1]);
}
m.appendTail(sb);
System.out.println(sb.toString());
}
}
But, if I have a replacement text array like this,
String[] test={"$$one","two","three","four"};
then, because of the $$, I am getting an exception in thread "main":
java.lang.IllegalArgumentException: Illegal group reference
at java.util.regex.Matcher.appendReplacement(Matcher.java:857)**
The following line is your problem:
System.out.println(matcher.replaceAll("test"));
If you remove it the loop will walk through all matches.
As a solution for your problem, you could replace the loop with something like this:
For Java 8:
StringBuffer out = new StringBuffer();
while (matcher.find()) {
String r = test[Integer.parseInt(matcher.group(1)) - 1];
matcher.appendReplacement(out, r);
}
matcher.appendTail(out);
System.out.println(out.toString());
For Java 9 and above:
String x = matcher.replaceAll(match -> test[Integer.parseInt(match.group(1)) - 1]);
System.out.println(x);
This only works, if you replace the $5 with $2 which is what I would assume is your goal.
Concerning the $ signs in the replacement string, the documentation states:
A dollar sign ($) may be included as a literal in the replacement string by preceding it with a backslash (\$).
In other words, you must write your replacement array as String[] test = { "\\$\\$one", "two", "three", "four" };
I can do a regex solution if you like, but this is much easier (assuming this is the desired output).
int count = 1;
for (String s : test) {
text = text.replace("$" + count++, s);
}
System.out.println(text);
It prints.
{"test1":"one","test2":"two","test3":"three","test4":"four"}
I want to split the string "004-034556" into two strings by the delimiter "-":
part1 = "004";
part2 = "034556";
That means the first string will contain the characters before '-', and the second string will contain the characters after '-'.
I also want to check if the string has '-' in it.
Use the appropriately named method String#split().
String string = "004-034556";
String[] parts = string.split("-");
String part1 = parts[0]; // 004
String part2 = parts[1]; // 034556
Note that split's argument is assumed to be a regular expression, so remember to escape special characters if necessary.
there are 12 characters with special meanings: the backslash \, the caret ^, the dollar sign $, the period or dot ., the vertical bar or pipe symbol |, the question mark ?, the asterisk or star *, the plus sign +, the opening parenthesis (, the closing parenthesis ), and the opening square bracket [, the opening curly brace {, These special characters are often called "metacharacters".
For instance, to split on a period/dot . (which means "any character" in regex), use either backslash \ to escape the individual special character like so split("\\."), or use character class [] to represent literal character(s) like so split("[.]"), or use Pattern#quote() to escape the entire string like so split(Pattern.quote(".")).
String[] parts = string.split(Pattern.quote(".")); // Split on the exact string.
To test beforehand if the string contains certain character(s), just use String#contains().
if (string.contains("-")) {
// Split it.
} else {
throw new IllegalArgumentException("String " + string + " does not contain -");
}
Note, this does not take a regular expression. For that, use String#matches() instead.
If you'd like to retain the split character in the resulting parts, then make use of positive lookaround. In case you want to have the split character to end up in left hand side, use positive lookbehind by prefixing ?<= group on the pattern.
String string = "004-034556";
String[] parts = string.split("(?<=-)");
String part1 = parts[0]; // 004-
String part2 = parts[1]; // 034556
In case you want to have the split character to end up in right hand side, use positive lookahead by prefixing ?= group on the pattern.
String string = "004-034556";
String[] parts = string.split("(?=-)");
String part1 = parts[0]; // 004
String part2 = parts[1]; // -034556
If you'd like to limit the number of resulting parts, then you can supply the desired number as 2nd argument of split() method.
String string = "004-034556-42";
String[] parts = string.split("-", 2);
String part1 = parts[0]; // 004
String part2 = parts[1]; // 034556-42
An alternative to processing the string directly would be to use a regular expression with capturing groups. This has the advantage that it makes it straightforward to imply more sophisticated constraints on the input. For example, the following splits the string into two parts, and ensures that both consist only of digits:
import java.util.regex.Pattern;
import java.util.regex.Matcher;
class SplitExample
{
private static Pattern twopart = Pattern.compile("(\\d+)-(\\d+)");
public static void checkString(String s)
{
Matcher m = twopart.matcher(s);
if (m.matches()) {
System.out.println(s + " matches; first part is " + m.group(1) +
", second part is " + m.group(2) + ".");
} else {
System.out.println(s + " does not match.");
}
}
public static void main(String[] args) {
checkString("123-4567");
checkString("foo-bar");
checkString("123-");
checkString("-4567");
checkString("123-4567-890");
}
}
As the pattern is fixed in this instance, it can be compiled in advance and stored as a static member (initialised at class load time in the example). The regular expression is:
(\d+)-(\d+)
The parentheses denote the capturing groups; the string that matched that part of the regexp can be accessed by the Match.group() method, as shown. The \d matches and single decimal digit, and the + means "match one or more of the previous expression). The - has no special meaning, so just matches that character in the input. Note that you need to double-escape the backslashes when writing this as a Java string. Some other examples:
([A-Z]+)-([A-Z]+) // Each part consists of only capital letters
([^-]+)-([^-]+) // Each part consists of characters other than -
([A-Z]{2})-(\d+) // The first part is exactly two capital letters,
// the second consists of digits
Use:
String[] result = yourString.split("-");
if (result.length != 2)
throw new IllegalArgumentException("String not in correct format");
This will split your string into two parts. The first element in the array will be the part containing the stuff before the -, and the second element in the array will contain the part of your string after the -.
If the array length is not 2, then the string was not in the format: string-string.
Check out the split() method in the String class.
This:
String[] out = string.split("-");
should do the thing you want. The string class has many method to operate with a string.
// This leaves the regexes issue out of question
// But we must remember that each character in the Delimiter String is treated
// like a single delimiter
public static String[] SplitUsingTokenizer(String subject, String delimiters) {
StringTokenizer strTkn = new StringTokenizer(subject, delimiters);
ArrayList<String> arrLis = new ArrayList<String>(subject.length());
while(strTkn.hasMoreTokens())
arrLis.add(strTkn.nextToken());
return arrLis.toArray(new String[0]);
}
With Java 8:
List<String> stringList = Pattern.compile("-")
.splitAsStream("004-034556")
.collect(Collectors.toList());
stringList.forEach(s -> System.out.println(s));
Use org.apache.commons.lang.StringUtils' split method which can split strings based on the character or string you want to split.
Method signature:
public static String[] split(String str, char separatorChar);
In your case, you want to split a string when there is a "-".
You can simply do as follows:
String str = "004-034556";
String split[] = StringUtils.split(str,"-");
Output:
004
034556
Assume that if - does not exists in your string, it returns the given string, and you will not get any exception.
The requirements left room for interpretation. I recommend writing a method,
public final static String[] mySplit(final String s)
which encapsulate this function. Of course you can use String.split(..) as mentioned in the other answers for the implementation.
You should write some unit-tests for input strings and the desired results and behaviour.
Good test candidates should include:
- "0022-3333"
- "-"
- "5555-"
- "-333"
- "3344-"
- "--"
- ""
- "553535"
- "333-333-33"
- "222--222"
- "222--"
- "--4555"
With defining the according test results, you can specify the behaviour.
For example, if "-333" should return in [,333] or if it is an error.
Can "333-333-33" be separated in [333,333-33] or [333-333,33] or is it an error? And so on.
To summarize: there are at least five ways to split a string in Java:
String.split():
String[] parts ="10,20".split(",");
Pattern.compile(regexp).splitAsStream(input):
List<String> strings = Pattern.compile("\\|")
.splitAsStream("010|020202")
.collect(Collectors.toList());
StringTokenizer (legacy class):
StringTokenizer strings = new StringTokenizer("Welcome to EXPLAINJAVA.COM!", ".");
while(strings.hasMoreTokens()){
String substring = strings.nextToken();
System.out.println(substring);
}
Google Guava Splitter:
Iterable<String> result = Splitter.on(",").split("1,2,3,4");
Apache Commons StringUtils:
String[] strings = StringUtils.split("1,2,3,4", ",");
So you can choose the best option for you depending on what you need, e.g. return type (array, list, or iterable).
Here is a big overview of these methods and the most common examples (how to split by dot, slash, question mark, etc.)
You can try like this also
String concatenated_String="hi^Hello";
String split_string_array[]=concatenated_String.split("\\^");
Assuming, that
you don't really need regular expressions for your split
you happen to already use apache commons lang in your app
The easiest way is to use StringUtils#split(java.lang.String, char). That's more convenient than the one provided by Java out of the box if you don't need regular expressions. Like its manual says, it works like this:
A null input String returns null.
StringUtils.split(null, *) = null
StringUtils.split("", *) = []
StringUtils.split("a.b.c", '.') = ["a", "b", "c"]
StringUtils.split("a..b.c", '.') = ["a", "b", "c"]
StringUtils.split("a:b:c", '.') = ["a:b:c"]
StringUtils.split("a b c", ' ') = ["a", "b", "c"]
I would recommend using commong-lang, since usually it contains a lot of stuff that's usable. However, if you don't need it for anything else than doing a split, then implementing yourself or escaping the regex is a better option.
For simple use cases String.split() should do the job. If you use guava, there is also a Splitter class which allows chaining of different string operations and supports CharMatcher:
Splitter.on('-')
.trimResults()
.omitEmptyStrings()
.split(string);
The fastest way, which also consumes the least resource could be:
String s = "abc-def";
int p = s.indexOf('-');
if (p >= 0) {
String left = s.substring(0, p);
String right = s.substring(p + 1);
} else {
// s does not contain '-'
}
String Split with multiple characters using Regex
public class StringSplitTest {
public static void main(String args[]) {
String s = " ;String; String; String; String, String; String;;String;String; String; String; ;String;String;String;String";
//String[] strs = s.split("[,\\s\\;]");
String[] strs = s.split("[,\\;]");
System.out.println("Substrings length:"+strs.length);
for (int i=0; i < strs.length; i++) {
System.out.println("Str["+i+"]:"+strs[i]);
}
}
}
Output:
Substrings length:17
Str[0]:
Str[1]:String
Str[2]: String
Str[3]: String
Str[4]: String
Str[5]: String
Str[6]: String
Str[7]:
Str[8]:String
Str[9]:String
Str[10]: String
Str[11]: String
Str[12]:
Str[13]:String
Str[14]:String
Str[15]:String
Str[16]:String
But do not expect the same output across all JDK versions. I have seen one bug which exists in some JDK versions where the first null string has been ignored. This bug is not present in the latest JDK version, but it exists in some versions between JDK 1.7 late versions and 1.8 early versions.
There are only two methods you really need to consider.
Use String.split for a one-character delimiter or you don't care about performance
If performance is not an issue, or if the delimiter is a single character that is not a regular expression special character (i.e., not one of .$|()[{^?*+\) then you can use String.split.
String[] results = input.split(",");
The split method has an optimization to avoid using a regular expression if the delimeter is a single character and not in the above list. Otherwise, it has to compile a regular expression, and this is not ideal.
Use Pattern.split and precompile the pattern if using a complex delimiter and you care about performance.
If performance is an issue, and your delimiter is not one of the above, you should pre-compile a regular expression pattern which you can then reuse.
// Save this somewhere
Pattern pattern = Pattern.compile("[,;:]");
/// ... later
String[] results = pattern.split(input);
This last option still creates a new Matcher object. You can also cache this object and reset it for each input for maximum performance, but that is somewhat more complicated and not thread-safe.
You can split a string by a line break by using the following statement:
String textStr[] = yourString.split("\\r?\\n");
You can split a string by a hyphen/character by using the following statement:
String textStr[] = yourString.split("-");
public class SplitTest {
public static String[] split(String text, String delimiter) {
java.util.List<String> parts = new java.util.ArrayList<String>();
text += delimiter;
for (int i = text.indexOf(delimiter), j=0; i != -1;) {
String temp = text.substring(j,i);
if(temp.trim().length() != 0) {
parts.add(temp);
}
j = i + delimiter.length();
i = text.indexOf(delimiter,j);
}
return parts.toArray(new String[0]);
}
public static void main(String[] args) {
String str = "004-034556";
String delimiter = "-";
String result[] = split(str, delimiter);
for(String s:result)
System.out.println(s);
}
}
Please don't use StringTokenizer class as it is a legacy class that is retained for compatibility reasons, and its use is discouraged in new code. And we can make use of the split method as suggested by others as well.
String[] sampleTokens = "004-034556".split("-");
System.out.println(Arrays.toString(sampleTokens));
And as expected it will print:
[004, 034556]
In this answer I also want to point out one change that has taken place for split method in Java 8. The String#split() method makes use of Pattern.split, and now it will remove empty strings at the start of the result array. Notice this change in documentation for Java 8:
When there is a positive-width match at the beginning of the input
sequence then an empty leading substring is included at the beginning
of the resulting array. A zero-width match at the beginning however
never produces such empty leading substring.
It means for the following example:
String[] sampleTokensAgain = "004".split("");
System.out.println(Arrays.toString(sampleTokensAgain));
we will get three strings: [0, 0, 4] and not four as was the case in Java 7 and before. Also check this similar question.
One way to do this is to run through the String in a for-each loop and use the required split character.
public class StringSplitTest {
public static void main(String[] arg){
String str = "004-034556";
String split[] = str.split("-");
System.out.println("The split parts of the String are");
for(String s:split)
System.out.println(s);
}
}
Output:
The split parts of the String are:
004
034556
import java.io.*;
public class BreakString {
public static void main(String args[]) {
String string = "004-034556-1234-2341";
String[] parts = string.split("-");
for(int i=0;i<parts.length;i++) ｛
System.out.println(parts[i]);
}
}
}
You can use Split():
import java.io.*;
public class Splitting
{
public static void main(String args[])
{
String Str = new String("004-034556");
String[] SplittoArray = Str.split("-");
String string1 = SplittoArray[0];
String string2 = SplittoArray[1];
}
}
Else, you can use StringTokenizer:
import java.util.*;
public class Splitting
{
public static void main(String[] args)
{
StringTokenizer Str = new StringTokenizer("004-034556");
String string1 = Str.nextToken("-");
String string2 = Str.nextToken("-");
}
}
Here are two ways two achieve it.
WAY 1: As you have to split two numbers by a special character you can use regex
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class TrialClass
{
public static void main(String[] args)
{
Pattern p = Pattern.compile("[0-9]+");
Matcher m = p.matcher("004-034556");
while(m.find())
{
System.out.println(m.group());
}
}
}
WAY 2: Using the string split method
public class TrialClass
{
public static void main(String[] args)
{
String temp = "004-034556";
String [] arrString = temp.split("-");
for(String splitString:arrString)
{
System.out.println(splitString);
}
}
}
You can simply use StringTokenizer to split a string in two or more parts whether there are any type of delimiters:
StringTokenizer st = new StringTokenizer("004-034556", "-");
while(st.hasMoreTokens())
{
System.out.println(st.nextToken());
}
Check out the split() method in the String class on javadoc.
https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#split(java.lang.String)
String data = "004-034556-1212-232-232";
int cnt = 1;
for (String item : data.split("-")) {
System.out.println("string "+cnt+" = "+item);
cnt++;
}
Here many examples for split string but I little code optimized.
String str="004-034556"
String[] sTemp=str.split("-");// '-' is a delimiter
string1=004 // sTemp[0];
string2=034556//sTemp[1];
I just wanted to write an algorithm instead of using Java built-in functions:
public static List<String> split(String str, char c){
List<String> list = new ArrayList<>();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < str.length(); i++){
if(str.charAt(i) != c){
sb.append(str.charAt(i));
}
else{
if(sb.length() > 0){
list.add(sb.toString());
sb = new StringBuilder();
}
}
}
if(sb.length() >0){
list.add(sb.toString());
}
return list;
}
You can use the method split:
public class Demo {
public static void main(String args[]) {
String str = "004-034556";
if ((str.contains("-"))) {
String[] temp = str.split("-");
for (String part:temp) {
System.out.println(part);
}
}
else {
System.out.println(str + " does not contain \"-\".");
}
}
}
To split a string, uses String.split(regex). Review the following examples:
String data = "004-034556";
String[] output = data.split("-");
System.out.println(output[0]);
System.out.println(output[1]);
Output
004
034556
Note:
This split (regex) takes a regex as an argument. Remember to escape the regex special characters, like period/dot.
String s = "TnGeneral|DOMESTIC";
String a[]=s.split("\\|");
System.out.println(a.toString());
System.out.println(a[0]);
System.out.println(a[1]);
Output:
TnGeneral
DOMESTIC
String s="004-034556";
for(int i=0;i<s.length();i++)
{
if(s.charAt(i)=='-')
{
System.out.println(s.substring(0,i));
System.out.println(s.substring(i+1));
}
}
As mentioned by everyone, split() is the best option which may be used in your case. An alternative method can be using substring().
I need a piece of code with which I can extract the substrings that are in uppercase from a string in Java.
For example:
"a:[AAAA|0.1;BBBBBBB|-1.90824;CC|0.0]"
I need to extract CC BBBBBBB and AAAA
You can do it with String[] split(String regex). The only problem can be with empty strings, but it's easy to filter them out:
String str = "a:[AAAA|0.1;BBBBBBB|-1.90824;CC|0.0]";
String[] substrings = str.split("[^A-Z]+");
for (String s : substrings)
{
if (!s.isEmpty())
{
System.out.println(s);
}
}
Output:
AAAA
BBBBBBB
CC
This should demonstrate the proper syntax and method. More details can be found here http://docs.oracle.com/javase/1.5.0/docs/api/java/util/regex/Pattern.html and http://docs.oracle.com/javase/1.5.0/docs/api/java/util/regex/Matcher.html
String myStr = "a:[AAAA|0.1;BBBBBBB|-1.90824;CC|0.0]";
Pattern upperCase = Pattern.compile("[A-Z]+");
Matcher matcher = upperCase.matcher(myStr);
List<String> results = new ArrayList<String>();
while (matcher.find()) {
results.add(matcher.group());
}
for (String s : results) {
System.out.println(s);
}
The [A-Z]+ part is the regular expression which does most of the work. There are a lot of strong regular expression tutorials if you want to look more into it.
If you want just to extract all the uppercase letter use [A-Z]+, if you want just uppercase substring, meaning that if you have lowercase letters you don't need it (HELLO is ok but Hello is not) then use \b[A-Z]+\b
I think you should do a replace all regular expression to turn the character you don't want into a delimiter, perhaps something like this:
str.replaceAll("[^A-Z]+", " ")
Trim any leading or trailing spaces.
Then, if you wish, you can call str.split(" ")
This is probably what you're looking for:
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class MatcherDemo {
private static final String REGEX = "[A-Z]+";
private static final String INPUT = "a:[AAAA|0.1;BBBBBBB|-1.90824;CC|0.0]";
public static void main(String[] args) {
Pattern p = Pattern.compile(REGEX);
// get a matcher object
Matcher m = p.matcher(INPUT);
List<String> sequences = new Vector<String>();
while(m.find()) {
sequences.add(INPUT.substring(m.start(), m.end()));
}
}
}