replaceFirst (String regex, String replacement)

public String replaceFirst(String regex, String replacement)

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

class StringReplaceFirst{
 public static void main(String args[]){
  String s1 = "aaab Krishna aab";
  String s2;
  
  s2 = s1.replaceFirst("ab", "Hi");
  
  System.out.println("s1 = " + s1);
  System.out.println("s2 = " + s2);
 }
}

Output

s1 = aaab Krishna aab
s2 = aaHi Krishna aab

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