Question: The Medium security code uses a PHP str _ replace function to identify and sanitize the ( Close the Reflected XSS Source window first. )

The Medium security code uses a PHP str_replace function to identify
and sanitize the
(Close the Reflected XSS Source window first.) This time it works.
Because the script tag isn't case-sensitive but the str_replace function
is, you can bypass it easily.
What does the str_replace function search for?
 The Medium security code uses a PHP str_replace function to identify

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