How do you replace a string in a regular expression in Java?

Java String replaceAll() example: replace word

  1. public class ReplaceAllExample2{
  2. public static void main(String args[]){
  3. String s1=”My name is Khan. My name is Bob. My name is Sonoo.”;
  4. String replaceString=s1.replaceAll(“is”,”was”);//replaces all occurrences of “is” to “was”
  5. System.out.println(replaceString);
  6. }}

Can we use regex in replace Java?

When we need to find or replace values in a string in Java, we usually use regular expressions. These allow us to determine if some or all of a string matches a pattern. We might easily apply the same replacement to multiple tokens in a string with the replaceAll method in both Matcher and String.

How do you replace a word in regex?

Start the match at the beginning of the input string. Match the pattern of one or more word characters followed by zero or one white-space characters one or more times. Match the end of the input string. The “$&” replacement pattern adds a literal quotation mark to the beginning and end of each match.

Which function is used for replacing the whole string with an alternate string?

Discussion Forum

Que. Which function is used for replacing whole string with an alternate string?
b. Strrpos ( )
c. Str_replace ( )
d. Replace ( )
Answer:Str_replace ( )

How do you replace a special character in a String?

Example of removing special characters using replaceAll() method

  1. public class RemoveSpecialCharacterExample1.
  2. {
  3. public static void main(String args[])
  4. {
  5. String str= “This#string%contains^special*characters&.”;
  6. str = str.replaceAll(“[^a-zA-Z0-9]”, ” “);
  7. System.out.println(str);
  8. }

How do you replace all special characters in a String in Java?

“java replace all special characters in string” Code Answer

  1. String str= “This#string%contains^special*characters&.”;
  2. str = str. replaceAll(“[^a-zA-Z0-9]”, ” “);
  3. System. out. println(str);

How do you replace a string in Java?

There are four overloaded method to replace String in Java : replace(char oldChar, char newChar) replace(CharSequence target, CharSequence replacement) replaceAll(String regex, String replacement) replaceFirst(String regex, String replacement) Out of these, 2nd one which takes a CharSequence is added on Java 1.5.

What is string replace method in Java?

Definition and Usage. The replace () method searches a string for a specified character,and returns a new string where the specified character (s) are replaced.

  • Syntax
  • Parameter Values
  • Technical Details
  • How does substring work in Java?

    SubString in Java. SubString(), a method of String class is used to get a part of original string as String object. This method is defined in java.lang.String class. This method returns part of String started from beginIndex up to the end of the original string.

    Is string array of chars in Java?

    Java char to String char is a primitive data type whereas String is a class in java. char represents single character whereas String can have zero of more characters. So String is an array of chars. We define char in java program using single quote (‘) whereas we can define String in java using double quotes (“).