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Purpose: Regular expression is everywhere in Unix   Also, we will give you some regex. Select one for a given pattern.  E.g.,   Positive numbers greater than or equal to 10 but less than 30.      E.g. 43, 45, 40, 59 are matched positive numbers A.     [1-3][0-9]   B.      [123][1-9]  C.      [1-2][0-9]  D.     [1-3]{2}  E.      None of above

Purpose: Regular expression is everywhere in Unix   Also, we will give you some regex. Select one for a given pattern.  E.g.,   Positive numbers greater than or equal to 10 but less than 30.      E.g. 43, 45, 40, 59 are matched positive numbers A.     [1-3][0-9]   B.      [123][1-9]  C.      [1-2][0-9]  D.     [1-3]{2}  E.      None of above

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Purpose: Regular expression is everywhere in Unix

 

Also, we will give you some regex. Select one for a given pattern. 

E.g.,

 

Positive numbers greater than or equal to 10 but less than 30.

     E.g. 43, 45, 40, 59 are matched positive numbers

A.     [1-3][0-9]  

B.      [123][1-9] 

C.      [1-2][0-9] 

D.     [1-3]{2} 

E.      None of above

Expert Solution
Step 1

Positive numbers greater than or equal to 10 but less than 30.

means e.g 10, 11 to 28, 29 etc

So the number should be 2 digited

1st digit should be 1 or 2

2nd digit should be 0 to 9

e.g. [a-z] means a to z inclusive

So 2 digited number should be [1-2][0-9]

 

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