What does isU of preg_match mean, what does preg_matchisu stand for_PHP Tutorial

What does isU of preg_match mean? preg_matchisu represents

/(.*)/isU after the regular expression. What does the "isU" parameter mean?
This is the modifier in the regular expression.
i searches for both uppercase and lowercase letters, and
s is a dot (.) that matches all characters, including line breaks. If s is not set, line breaks are not included. The symbol .
U inverts the value of the matching number so that it is not repeated by default, but becomes repeated when followed by "?"

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