gs gs101 Regular Expressions and Languages - Regular Expression in UNIX - Quiz No.1
gs gs101 Automata Theory Quiz
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Question 1: Which among the following is not a UNIX command for regular expressions?
ed
sed
vi
none of the mentioned
Question 2: What is the significance of $ used in regular expression in UNIX?
Matches the beginning of the line
Matches the end of lines
Matches any single character
None of the mentioned
Question 3: Generate the regular expression to match blank lines
/ */
/bl
/^?/
/^$/
Question 4: For the given syntax of sed, which among the following is not a correct option?
General syntax of sed: /pattern/action
General syntax of sed: /pattern/action
/ are used as delimiters
pattern refers to a regular expression
pattern refers to the string to be matched
action refers to the command
Question 5: What does grep do in UNIX?
It is an editor in UNIX
It searches for text patterns
It is an editor in UNIX and it searches for text patterns
None of the mentioned
Question 7: Which of the following options support the given statement?
Statement: A regular expression could be a fixed word or describe something like more general.
Statement: A regular expression could be a fixed word or describe something like more general.
This flexibility makes Regular expression invaluable
This flexibility makes the Regular expression unvaluable
This flexibility makes Regular expression invaluable and unvaluable
None of the mentioned
Question 8: What does the following segment of code does?
grep -i man heroes.txt
grep -i man heroes.txt
manually opens a file called heroes.txt
manages heroes.txt
search for “man” in the file “heroes.txt”
none of the mentioned
Question 9: What does “X?” do regular expression operator?
Matches zero or more capital X’s
Matches no or one occurence of the capital letter X
Matches one or more capital X’s
All of the mentioned
Question 10: Which of the following does not support regular expressions?
sed
awk
emacs
none of the mentioned
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