replaceAll (String regex, String replacement)

public String replaceAll(String replacement)

Replaces each substring of this string that matches the given regular expression with the given replacement.

class StringReplaceAll{
 public static void main(String args[]){
  String s1 = "aab Krishna";
  String s2;
  
  s2 = s1.replaceAll("a(.*)b", "Hi");
  
  System.out.println("s1 = " + s1);
  System.out.println("s2 = " + s2);
 }
}

Output

s1 = aab Krishna
s2 = Hi Krishna

1. Throws PatternSyntaxException if the regular expression's syntax is invalid

class StringReplaceAllPatternSyntax{
 public static void main(String args[]){
  String s1 = "aab Krishna";
  String s2;
  
  s2 = s1.replaceAll("a(*)b", "Hi");
  
  System.out.println("s1 = " + s1);
  System.out.println("s2 = " + s2);
 }
}

Output

Exception in thread "main" java.util.regex.PatternSyntaxException: Dangling meta
 character '*' near index 2
a(*)b
  ^
        at java.util.regex.Pattern.error(Pattern.java:1955)
        at java.util.regex.Pattern.sequence(Pattern.java:2123)
        at java.util.regex.Pattern.expr(Pattern.java:1996)
        at java.util.regex.Pattern.group0(Pattern.java:2905)
        at java.util.regex.Pattern.sequence(Pattern.java:2051)
        at java.util.regex.Pattern.expr(Pattern.java:1996)
        at java.util.regex.Pattern.compile(Pattern.java:1696)
        at java.util.regex.Pattern.<init>(Pattern.java:1351)
        at java.util.regex.Pattern.compile(Pattern.java:1028)
        at java.lang.String.replaceAll(String.java:2210)
        at StringReplaceAllPatternSyntax.main(StringReplaceAllPatternSyntax.java:6)

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