Java String Remove All Non Numeric Characters But Keep the Decimal Separator

Java String remove all non numeric characters but keep the decimal separator

Try this code:

String str = "a12.334tyz.78x";
str = str.replaceAll("[^\\d.]", "");

Now str will contain "12.334.78".

Java Regex - remove non-numeric characters

Here is one viable approach:

String input = "hello world -23 as-df blah blah blah";
String output = input.replaceAll("[^\\d-]|-(?=\\D)", "");
System.out.println(output);

This prints:

-23

The regex used here says to match:

[^\\d-]   any non numeric character EXCEPT for dash (i.e. spare -)
|         OR
-(?=\\D)  remove dash if NOT followed by a number

That is, we do strip off dash if it not be part of a negative number. The replacement is empty string, to remove this unwanted content.

Java remove non numeric characters from string except x

use this: [^x0-9]

You may check it on http://gskinner.com/RegExr/

RegEx to remove non-digit and non-decimal point from string

You may use:

str = str.replaceAll("[^\\d.]+", "");

[^\\d.] is negated character class that will match any character except digit or dot.

Added + to make this bit more efficient.

RegEx Demo

How to remove all non-numerical characters from a string input in java?

You can use this method to convert your string to only numericals:

 public String getNumericString(String ourString)
  {

    StringBuilder neededCharacters = new StringBuilder();

    //Read throught the entire length of your input string
    for(int i = 0;i<ourString.length();i++)
    {
      //Get the current character
        char ch = ourString.charAt(i);

   //Check if the character is a numerical
        if (Character.isDigit(ch))
        {
         //if the character is a number then add it to our string 
        // builder
            neededCharacters.append(r.charAt(i));

        }
    }
    onlyNumericalString = needed.toString();
    return onlyNumericalString;
   }

You can ask me if you don't understand anything in the code.You should make small edits depending on your needs.

Removing all but the first two numbers in a decimal

Multiply by 10,000 (100 for percentage, 100 for the two decimal places), truncate to integer, divide by 100 (to get back to percentage).

Writing it out one step at a time, for clarity of exposition:

Double n = input.nextDouble();
int i = (int)(n * 10_000);
Double pc = i / 100.0;
System.out.printf("%.2f\n", pc);

Java substring keep only digits and decimal

Try using a replaceAll on the string, specifying all characters that are not a decimal point or number:

myString = myString.replaceAll("[^0-9\\.]","");

"^0-9\." means all characters that are not a number 0 through 9, or a decimal. The reason why we put two slashes are to escape the period, as it has a different connotation in a Java regex than the literal character '.'.

Strip all non-numeric characters from string in JavaScript

Use the string's .replace method with a regex of \D, which is a shorthand character class that matches all non-digits:

myString = myString.replace(/\D/g,'');

Remove all non-numeric characters but keep a specific word

This should do the trick

Pattern pattern = Pattern.compile("Vol ([A-Z]{3}) Ch (\\d{3})");
Matcher matcher = pattern.matcher(input);
if(matcher.find()){
  String volume = matcher.group(1);
  String chapter = matcher.group(2);
}

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