Using the Captured Text of a Group within a
Replacement Pattern
In this section, you will learn how to use the captured
text from the group of the text. This section illustrates you how to capture the
string or text through the regular expression and it is also used through the
regular expression. Here as you seen the regular expression of the code which
has been used to capture each and every word one by one i.e. "(\\w+)"
and another regular expression is "\"$1\"" i.e. used to
replace with the same word covering by the "<>" characters.
"$1": This is the regular expression
which determines the same word or characters where it is used for the specific
purposes.
Here is the code of the program:
import java.util.regex.*;
import java.io.*;
public class CapturedText{
public static void main(String[] args) throws IOException{
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter string: ");
String string = in.readLine();
Pattern p = Pattern.compile("(\\w+)");
Matcher m = p.matcher(string);
String str = m.replaceAll("\"$1\"");
System.out.println(str);
}
}
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