How can I easily tell if these following are a well-formed expresion: ([]{XXX}xxx()xxx)([{[(([{x}])x)]}x]) (XX[XXX)XX]([{[(([{x}])x)]}x}) (XX(XX())XXX)XXX)   so far it's confusing to understand what makes something a well-formed expresion and something that's an ill-formed expression

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
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How can I easily tell if these following are a well-formed expresion:

([]{XXX}xxx()xxx)
([{[(([{x}])x)]}x])

(XX[XXX)XX]
([{[(([{x}])x)]}x})

(XX(XX())XXX)XXX)

 

so far it's confusing to understand what makes something a well-formed expresion and something that's an ill-formed expression

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