Java String.replaceFirst() to replace First occurrence of char or string

string.replaceFirst()

String.replaceFirst() replace First occurrence of matching char or string .
Here are some examples with output.
Replacing char

String str = "Welcome to plus2net.com";  
System.out.println(str.replaceFirst("o","*"));

Output is here

Welc*me to plus2net.com

Replacing string

String str = "Welcome to plus2net.com";  
System.out.println(str.replaceFirst("com","net"));

Output is here

Welnete to plus2net.com

Note : In above code, there is one replacement.

All String functions

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string.replaceFirst()