Write a function called substring that uses the leftmatch and rightmatch functions to remove a pattern from the left and right side of a value. It should take three arguments as shown: $ substring /usr/ /usr/spool/uucppublic /uucppublic spool $ substring s. s.main.c .c main $ substring s. s.main.c .o Only left match main.c $ substring x. s.main.c .o No matches s. main.c

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
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Write a function called substring that uses the leftmatch and rightmatch functions to remove a pattern from the left and right side of a value. It should take three arguments as shown:

$ substring /usr/ /usr/spool/uucppublic /uucppublic

spool

$ substring s. s.main.c .c

main

$ substring s. s.main.c .o Only left match

main.c

$ substring x. s.main.c .o No matches

s. main.c

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