Perl question mark syntax

Will someone explain to me what the question marks mean in the four places used in this statement?

if(m/DROP TABLE IF EXISTS \`?$tableName\`?/ || m/CREATE TABLE \`?$tableName\`?/){
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ozoConnect With a Mentor Commented:
perldoc perlre


       The following standard quantifiers are recognized:

           *      Match 0 or more times
           +      Match 1 or more times
           ?      Match 1 or 0 times
           {n}    Match exactly n times
           {n,}   Match at least n times
           {n,m}  Match at least n but not more than m times
vikaskhoriaConnect With a Mentor Commented:
The statement given by you is using a regex.
In a regex there are several meta-characters.
Like the ones specified by ozo above.

? is one of the meta-characters.

This checks 0 or 1 occurrence of the preceding character

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