Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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? character as a shorthand for accessing this documentation. How to use the ? character in python. 

Expert Solution
Check Mark
Step 1

Python Regular Expression Question Mark (?):

As an exceptional person '?' makes the subsequent RE match 0 or 1 reiteration of the former RE. stomach muscle? will match either 'a' or 'stomach muscle'

The question mark strict '?' is involved following ways according to Python docs.

When applied to regular expression  A, Python's A? quantifier matches either zero or one event of A. For instance, the standard articulation 'hello?' matches the two strings 'he' and 'hello', yet not the unfilled string ''. This is on the grounds that the? quantifier doesn't make a difference to the entire regex 'hello' yet just to the previous regex 'y'.

 

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