Java: Remove numbers from string

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I have a string like 23.Piano+trompet, and i wanted to remove the 23. part from the string using this function:

private String removeSignsFromName(String name) {
    name = name.replaceAll(" ", "");
    name = name.replaceAll(".", "");

    return name.replaceAll("\\^([0-9]+)", "");
}

But it doesn't do it. Also, there is no error in runtime.

The following replaces all whitespace characters (\\s), dots (\\.), and digits (\\d) with "":

name.replaceAll("^[\\s\\.\\d]+", "");

what if I want to replace the + with _?

name.replaceAll("^[\\s\\.\\d]+", "").replaceAll("\\+", "_");

How to remove all special characters from String in Java, How do I remove numbers from a string in Java? Functions used to remove numbers from a string in Java .replaceAll(“to_be_replaced”,”replace_with”) which can be used to replace all values of the variable “to_be_replaced” with the values of “replace_with”

You don't need to escape the ^, you can use \\d+ to match multiple digits, and \\. for a literal dot and you don't need multiple calls to replaceAll. For example,

private static String removeSignsFromName(String name) {
    return name.replaceAll("^\\d+\\.", "");
}

Which I tested like

public static void main(String[] args) {
    System.out.println(removeSignsFromName("23.Piano+trompet"));
}

And got

Piano+trompet

Java: Remove numbers from string, How do you remove special characters and numbers in a string in Java? How to Remove Special Characters from String in Java. A character which is not an alphabet or numeric character is called a special character. We should remove all the special characters from the string so that we can read the string clearly and fluently. Special characters are not readable, so it would be good to remove them before reading.

Two problems:

  1. The . in the second replaceAll should be escaped:

    name=name.replaceAll("\\.", "");
    
  2. The ^ in the third one should NOT be escaped:

    return name.replaceAll("^([0-9]+)", "");
    

Oh! and the parentheses are useless since you don't use the captured string.

How to Remove Numbers from a String in Java, except a to z, A to Z, 0 to 9,_ and dash. how to remove symbols from string in java, replace unwanted characters from java string variable, replaceAll() to remove unwanted characters from string in java Please consider disabling your ad blocker for Java4s.com, we won't encourage audio ads, popups or any other annoyances at any point, hope you support us :-) Thank you.

How about this:

public static String removeNumOfStr(String str) {
    if (str == null) {
        return null;
    }
    char[] ch = str.toCharArray();
    int length = ch.length;
    StringBuilder sb = new StringBuilder();
    int i = 0;
    while (i < length) {
        if (Character.isDigit(ch[i])) {
            i++;
        } else {
            sb.append(ch[i]);
            i++;
        }
    }
    return sb.toString();
}

Removing all digits, non-digits, whitespaces (from Strings) and other , The following replaces all whitespace characters ( \\s ), dots ( \\. ), and digits ( \\d ) with "" : name.replaceAll("^[\\s\\.\\d]+", "");. what if I want to  As you can see from these examples, the Java String class replaceAll method makes it easy to strip/remove characters from one String and assign the resulting output to another String. The only trick in the process is knowing that you can really strip/delete characters from a String using the technique shown here.

return name.replaceFirst("^\\d+\\.", "");

Java program to remove all numbers in a string except "1" and "2"?, Functions used to remove numbers from a string in Java. import java. util. Scanner; class deletion. { public static void main(String[] args) { Scanner sc = new Scanner(System. in); String inp; // Variable 'inp',for storing the input. System. out. println("Enter your string:"); replaceAll (String regex, String replacement): It’s like the replaceFirst () method. The only difference is that all the occurrences of the matched regex are replaced with the replacement string. NOTE: There is no empty character constant. So we can’t use the first replace (char c1, char c2) method to remove a character from the string.

Remove all non digit characters from String – Bytefreaks.net, Or maybe remove all white spaces. For this, the replaceAll method comes in handy. The replaceAll method is part of Java's String class, and is  Many times string contains numbers and letters and you want to keep only numbers by removing the non-numeric characters from the string. This can be done using the regular expression and the replaceAll method of String class.

Remove Numbers From String JAVA net beans #146, Java program to remove all numbers in a string except "1" and "2"? The regular expression "(? The replaceAll() method accepts two strings: a regular expression pattern and, the replacement string and replaces the pattern with the specified string. Java Remove Character from String. If you notice String class, we have replace () methods with different variations. Let’s see what all overloaded replace () methods String class has; replace (char oldChar, char newChar): Returns a string resulting from replacing all occurrences of oldChar in this string with newChar.

Remove Characters from Number String in Java, The following Java snippet removes all non-digit characters from a String. on the character classes supported by Java pattern visit the following link. to 126] in decimal) and they represent letters, digits, punctuation marks,  Java program to extract digits/ numbers from the string This program will extract the digits, numbers from the string using java program, in this program we will read a string that will contain digits in the string and will extract the digits, numbers from the inputted string. Extract Digits/ Numbers from String using Java Program

Comments
  • You escape the ^, so it searches for a literal ^, which is not present.
  • . matches any character and replaceAll() replaces all the characters. Escape the dot "\\."
  • he needs the ^, if he want to make sure the replacement can only occur on the beginning of string. however he should not escape the ^ Your pattern will replace all number + dots in the text, don't know if it is desired. Also, what for the grouping, it makes no sense, does it?