Regular Expression Search Program
Regular Expression: Regular Expression is used
to perform many string related operations. This is the way to manipulate different kind
of operations like search, edit and manipulating string can be
performed by the regular expression. It has both type characters (literal
characters and meta characters). In this section, you will learn how to search a
string from the given string exactly.
Program Result: Following program gives you the
search facility in which it takes two string/text. One is searched in another
one text or string and tells you for the occurrence of the given string for
searching into a long string. If the string does not lies in the given string
from which the string has to be searched.
Code Description
Pattern:
This is the class of the java.util.regex package which is the
compiled representation. Specified string is first compiled into an instance of
this class. The pattern to be used to create a matcher object which finds the
character sequences for the regular expression.
Matcher:
This is also a class of java.util.regex package which is used to
match character sequences.
matcher.find():
Above method finds the matched string in the given string for searching.
This method returns a boolean value either true or false.
Here is the code of the program:
import java.util.regex.*;
import java.io.*;
public class SearchProgram{
public static void main(String[] args) throws IOException{
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter string in which we have to search: ");
String string = in.readLine();
System.out.print("Enter string to search: ");
String str = in.readLine();
Pattern pattern = Pattern.compile(str);
Matcher matcher = pattern.matcher(string);
int a = 0;
while(matcher.find()){
a = a + 1;
}
if(a == 0)
System.out.println("Word not found.");
else
System.out.println("Occurrence of the word is: " + a);
}
}
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Download this example.
Output of the program:
C:\java\util>java SearchProgram
Enter string in which we have to search: dtwerb wewrvwervwe chandan
Enter string to search: w
Occurrence of the word is: 5
C:\java\util>_
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Current Comments
1 comments so far (post your own) View All Comments Latest 10 Comments:Plz help me: flow of control,
Pattern p = Pattern.compile(".+@.+\\.[a-zA-Z]+");
Posted by Neeraj on Wednesday, 05.21.08 @ 14:51pm | #60585