regionMatches()

regionMatches method matches two strings, it matches the characters of second string with the characters of the first string from the point defined in the syntax. The string comparison start from the

Description of regionMatches() method:

str1. regionMatches ( 4 , str2 , 4 , 7 )

str1 :name of the string with which to compare the second strnig

regionMAtches::: keyword

4 : it is the starting index of first index, from where to start matching the region of str1 with the region of str2..

str2: name of the second string whose region we have to match with first string str1

4: is the startring index of second string, matching of second string with first string str1 will start from this starting index number that is 4

7 : is the number of characters from starting index number of second string,, the starting index of str2 is 4, then the the region will be compared upto 10 more characters.

true: is for case senstivity..

Program for regionMatches()    : 

import java.io.*;
public class RegionM
{
public static void main(String args[])
{
String str1=new String("Gurpreet Singh");
String str2=new String("Manpreet Singh");
String str3=new String("Gurinder singh");
System.out.println("comparing str1 and str2"+str1.regionMatches(4,str2,4,7));
System.out.println("comparing str2 and str3"+str2.regionMatches(true,3,str3,3,7));
}
}

Output:

Searching String - lastIndexOf()

To search for the last occurence of a specific character  in the string , lastIndexOf() function is used.This function returns an integer type value ,it returns the last occurrence of the specified character in the string.The charcter should be written in single quote
Syntax:    Stringname.lastIndexOf('ChararacterToBeSearched');

The same function can be used to search for a particular string in a complete string.The string is always written in double quotes.This function will return he last occurence of the string in the complete string.If the string 
Syntax :   Stringname.lastIndexOf("StringToBeSearched");

If you want to search for a character after a particular number of characters, then the start index is also given along with the character, when the program is compiled by Java complier , compiler donot search for the specified character upto that index number specified by you.
Syntax:  Stringname.lastIndexOf('ChararacterToBeSearched',StartIndex);

In the same way if you want to search a string or a word in the string to be searched then the start index is given along with the string to be searched. Compler during compiling donot search forthe string upto that index numbered entered.
Syntax::   Stringname.lastIndexOf("StringToBeSearched",StartIndex);

Program for lastIndexOf()

class Last

{

public static void main(String arg[]) 

{

String s= "this is the duty of every citizen of india to serve his country at the cost of anything";

System.out.println(s);

System.out.println(s.indexOf('o'));

System.out.println(s.lastIndexOf('o'));

System.out.println(s.indexOf("the"));

System.out.println(s.lastIndexOf("the"));

System.out.println(s.indexOf("o",10));

System.out.println(s.lastIndexOf('o',60));

System.out.println(s.indexOf("the",10));

System.out.println(s.lastIndexOf("the",60));

}

}

Output of the above code is :