Split String into Array based on multiple delimiters in Java

Question

I am trying to split a string into two different arrays based on multiple values

For example user inputs in the console window

   2+4/8*9

I want only the numbers to be in an array

Arr[0] = 2;
Arr[1] = 4;
Arr[2] = 8;
Arr[3] = 9;

And then

Operator[0] = +;
Operator[1] = /;
Operator[2] = *;

I am familiar with split method that uses only one delimiter but how will I be able to split the string based on various number of delimiters?

Following is the latest code I have tried by looking at various articles on the internet but getting error

Scanner in = new Scanner(System.in);
System.out.println("Enter input");
s = in.toString();

String [] operators = s.split("+|-|*|/"); //Also tried s.split("\\+\\-\\*\\/")

for(int i = 0; i<operators.length; i++) {
    System.out.println(operators[i]);
}

Use Spring.split() method and pass the Regex as an argument to the method. — Ashish Ani
– Ashish Ani, Commented Jan 26, 2016 at 15:42

Bathsheba · Accepted Answer · 2016-01-26 15:33:06Z

1

The string argument in split is a regular expression.

*, +, -, and / have special meanings in a regular expression. (The asterisk means "match any").

You need to escape them if you want to match them as exact symbols.

To do that use \\* etc. \* means a literal asterisk in a regular expression: in Java you need to escape the backslash; you do that by writing \\.

So you ought to use something like

\\+|\\-|\\*|\\/

answered Jan 26, 2016 at 15:33

Bathsheba

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1 Comment

Danish Ali Over a year ago

Tried this now getting this error java.util.Scanner[delimiters=\p{javaWhitespace} ][position=0][match valid=false][need input=false][source closed=false][skipped=false][group separator=\,][decimal separator=\.][positive prefix=][negative prefix=\Q \E][positive suffix=][negative suffix=][NaN string=\Q?\E][infinity string=\Q?\E]

John S. · Accepted Answer · 2016-01-26 17:51:33Z

1

Try this.

String str = "2+2-4*5/6";
str = str.replaceAll(" ", "");
String[] Arr = str.replaceAll("[\\+\\-\\*\\/]", " ").split(" ");
String[] Operator = str.replaceAll("[0-9]", " ").split(" ");

Hope that helps!

answered Jan 26, 2016 at 17:51

John S.

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Comments

arg0100 · Accepted Answer · 2019-12-08 06:23:11Z

1

Using Regex we can split the expression and store the operand in String[]

String[] t = st.split("-|\\#|\\(|\\)|\\{|\\}|\\<|\\>|\\s+|\\(\\\"|\\;");

The regex expression split String based on "-, #, (, ), {, }, <, >, space, ;, #" for character like "(double quote) and (backlash) then iterate the elements of String and remove the char.

answered Dec 8, 2019 at 6:23

arg0100

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Comments

devops · Accepted Answer · 2016-01-26 15:50:53Z

0

Use non-digit Regex to split your string:

String input     = "14*6+22";
String[] spl     = input.split("\\D");
char[] operation = input.replaceAll("\\w", "").toCharArray();

System.out.println(Arrays.toString(spl));
System.out.println(Arrays.toString(operation));

edited Jan 26, 2016 at 15:50

answered Jan 26, 2016 at 15:41

devops

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