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JavaScript Questions & Answers – Pattern Matching and Regular Expressions | JavaScript MCQs

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Free download in PDF JavaScript Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) The ‘$’ present in the RegExp object is called a ____________
[A] character
[B] matcher
[C] metacharacter
[D] metadata
Answer: metacharacter
(2) Consider the following JavaScript statement containing regular expressions and check if the pattern matches? 
var text = "testing: 1, 2, 3"; 
var pattern = /\d+/g;
[A] text==pattern
[B] text.equals(pattern)
[C] text.test(pattern)
[D] pattern.test(text)
Answer: pattern.test(text)

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(3) The regular expression to match any one character not between the brackets is __________
[A] […]
[B] [^]
[C] [^…]
[D] [\D]
Answer: [^…]
(4) What does /[^(]* regular expression indicate?
[A] Match one or more characters that are not open parenthesis
[B] Match zero or more characters that are open parenthesis
[C] Match zero or more characters that are not open parenthesis
[D] Match one or more characters that are open parenthesis
Answer: Match zero or more characters that are not open parenthesis
(5) What will be the result when non greedy repetition is used on the pattern /a+?b/?
[A] Matches the letter b preceded by the fewest number of a’s possible
[B] Matches the letter b preceded by any number of a
[C] Matches letter a preceded by letter b, in the stack order
[D] Matches letter a present in the string
Answer: Matches the letter b preceded by the fewest number of a’s possible
(6) What does the subexpression /java(script)?/ result in?
[A] It matches “java” followed by the optional “script”
[B] It matches “java” followed by any number of “script”
[C] It matches “java” followed by a minimum of one “script”
[D] It matches “java” followed by a single “script”
Answer: It matches “java” followed by the optional “script”
(7) What is the most essential purpose of parentheses in regular expressions?
[A] Define pattern matching techniques
[B] Define subpatterns within the complete pattern
[C] Define portion of strings in the regular expression
[D] matching the complete string
Answer: Define subpatterns within the complete pattern
(8) The method that performs the search-and-replace operation to strings for pattern matching is _______
[A] searchandreplace()
[B] add()
[C] edit()
[D] replace()
Answer: replace()
(9) What would be the result of the following statement in JavaScript using regular expression methods?
[A] Returns [“123″”456″”789”]
[B] Returns [“123″,”456″,”789”]
[C] Returns [1,2,3,4,5,6,7,8,9]
[D] Throws an exception
Answer: Returns [“123″,”456″,”789”]
(10) What will be the purpose of exec() in the following JavaScript code? 
var pattern = /Java/g;
    var text = "JavaScript is more fun than Java!";
    var result;
    while ((result = pattern.exec(text)) != null) 
    {
        alert("Matched '" + result[0] + "'" +" at position " + result.index +"; 
              next search begins at " + pattern.lastIndex);
    }
[A] Returns the same kind of array whether or not the regular expression has the global g flag
[B] Returns different arrays in the different turns of iterations
[C] Return a sub part of the array
[D] Returns a null value
Answer: Returns the same kind of array whether or not the regular expression has the global g flag
(11) What will be the output of the following JavaScript code? 
System.out.println(Pattern.matches("[amn]", "abcd"));
[A] true
[B] false
[C] undefined
[D] a
Answer: false
(12) What will be the output of the following JavaScript code? 
System.out.println(Pattern.matches("[amn]?", "a"));
[A] true
[B] false
[C] undefined
[D] bcd
Answer: true
(13) What will be the output of the following JavaScript code? 
System.out.println(Pattern.matches("\\d", "1"));
[A] true
[B] false
[C] undefined
[D] 1
Answer: true
(14) What will be the output of the following JavaScript code? 
 System.out.println(Pattern.matches("[adf]+", "a"));
[A] true
[B] false
[C] undefined
[D] 0
Answer: true
(15) What will be the output of the following JavaScript code? 
 System.out.println(Pattern.matches("[^abc]", "aemngq"));
[A] true
[B] false
[C] undefined
[D] 1
Answer: false

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