Question

create a regular expression in Java that defines the following.

A "Stir" is a right brace '}' followed by zero or more
lowercase letters 'a' through 'z' and decimal digits '0'
through '9', followed by a left parenthesis '('.

Answer 1

import java.util.regex.Matcher;
import java.util.regex.Pattern;

class Test
{
   public static void main(String args[])
   {

//here we are declaring the pattern for regex according to given rules
       Pattern mypattern = Pattern.compile("[}][a-z0-9]+[(]");

// we are creating a matcher class object which lookasfor the pattern defined in the given input string.
       Matcher m1 = mypattern.matcher("}abc897(");

//this loop will print the pattren beginning and ending of the pattern in the given input string
       while (m1.find())
       {
           System.out.println("In }abc897( Pattern is found from "+m1.start()+" to "+(m1.end()-1));
       }

// this will check whether the given input string matches with the pattern exactly or not
       if(Pattern.matches("[}][a-z0-9]+[(]", "{0a)")==false)
       {
       System.out.println("In abc897) Pattern match not found.");
       }
   }
}

Time(sec) 0.08 Memory(MB): 56.8359 Output: Copy In Jabc897( Pattern is found from e to 7 In abc897) Pattern match not found.