What does the ISU of Preg_match mean, Preg_matchisu represents _php tutorial

What does the ISU of Preg_match mean, Preg_matchisu represents

What does the "IsU" parameter mean after the/(. *)/isu of the regular?
This is the modifier in the regular.
I am also looking for uppercase and lowercase letters,
S is a dot (.) Matches all characters, including line breaks. If S is not set, the line break is not included.
You are reversing the value of the matched quantity so that it is not the default repetition, and it becomes followed by "?". It just gets repetitive.

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