gs gs106 Classes and Modules - JavaScript Pattern Matching and Regular Expressions - Quiz No.1
gs gs106 Javascript Quiz
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Question 1: The ‘$’ present in the RegExp object is called a ____________
character
matcher
metacharacter
metadata
Question 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;
text==pattern
text.equals(pattern)
text.test(pattern)
pattern.test(text)
Question 4: What does /[^(]* regular expression indicate?
Match one or more characters that are not open parenthesis
Match zero or more characters that are open parenthesis
Match zero or more characters that are not open parenthesis
Match one or more characters that are open parenthesis
Question 5: What will be the result when non greedy repetition is used on the pattern /a+?b/?
Matches the letter b preceded by the fewest number of a’s possible
Matches the letter b preceded by any number of a
Matches letter a preceded by letter b, in the stack order
Matches letter a present in the string
Question 6: What does the subexpression /java(script)?/ result in?
It matches “java” followed by the optional “script”
It matches “java” followed by any number of “script”
It matches “java” followed by a minimum of one “script”
It matches “java” followed by a single “script”
Question 7: What is the most essential purpose of parentheses in regular expressions?
Define pattern matching techniques
Define subpatterns within the complete pattern
Define portion of strings in the regular expression
matching the complete string
Question 8: The method that performs the search-and-replace operation to strings for pattern matching is _______
searchandreplace()
add()
edit()
replace()
Question 9: What would be the result of the following statement in JavaScript using regular expression methods?
Returns [“123″”456″”789”]
Returns [“123″,”456″,”789”]
Returns [1,2,3,4,5,6,7,8,9]
Throws an exception
Question 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); }
Returns the same kind of array whether or not the regular expression has the global g flag
Returns different arrays in the different turns of iterations
Return a sub part of the array
Returns a null value
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