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Is Java matcher thread safe in Java?
A regular expression is a special sequence of characters that helps you match or find other strings or sets of strings, using a specialized syntax held in a pattern. They can be used to search, edit, or manipulate text and data. Java provides the java.util.regex package for pattern matching with regular expressions.
Matcher class
A Matcher object is the engine that interprets the pattern and performs match operations against an input string. Like the Pattern class, Matcher defines no public constructors. You obtain a Matcher object by invoking the matcher() method on a Pattern object.
The Instances of this class are not safe for use by multiple concurrent threads.
Example
Following Java program accepts 5 strings from the user and prints the strings starting with a digit.
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class StartingwithDigit {
public static void main( String args[] ) {
String regex = "^[0-9].*$";
Scanner sc = new Scanner(System.in);
System.out.println("Enter 5 input strings: ");
String input[] = new String[5];
for (int i=0; i<5; i++) {
input[i] = sc.nextLine();
}
//Creating a Pattern object
Pattern p = Pattern.compile(regex);
System.out.println("Strings starting with digits: ");
for(int i=0; i<5;i++) {
//Creating a Matcher object
Matcher m = p.matcher(input[i]);
if(m.matches()) {
System.out.println(m.group());
}
}
}
}Output
Enter 5 input strings: sample string 1 sample string 2 11 sample string 3 22 sample string 4 43534 56353 636 Strings starting with digits: 11 sample string 3 22 sample string 4 43534 56353 636
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