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the properties whose names start with an underscore character (_), which are considered private to the aggregated class, are always excluded.
the properties whose names start with an underscore character (_), which are considered private to the aggregated class, are always excluded.

the class constructor or methods whose names start with an underscore character (_), which are considered private to the aggregated class, are always excluded.
the class constructor or methods whose names start with an underscore character (_), which are considered private to the aggregated class, are always excluded.

aggregates all properties defined in a class to an existing object, except for properties whose names start with an underscore character (_) which are considered private to the aggregated class.
aggregates all properties defined in a class to an existing object, except for properties whose names start with an underscore character (_) which are considered private to the aggregated class.

aggregates all methods defined in a class to an existing object, except for the class constructor, or methods whose names start with an underscore character (_) which are considered private to the aggregated class.
aggregates all methods defined in a class to an existing object, except for the class constructor, or methods whose names start with an underscore character (_) which are considered private to the aggregated class.

aggregates methods and properties defined in a class to an existing object. methods and properties with names starting with an underscore character (_) are considered private to the aggregated class and are not used, constructors are also excluded from the aggregation procedure.
methods and properties with names starting with an underscore character (_) are considered private to the aggregated class and are not used, constructors are also excluded from the aggregation procedure.

a "word" character is any letter or digit or the underscore character, that is, any character which can be part of a perl "word ". the definition of letters and digits is controlled by pcre's character tables, and may vary if locale-specific matching is taking place (see "locale support" above). for example, in the "fr" (french) locale, some char- acter codes greater than 128 are used for accented letters, and these are matched by \w.
so, while both \d + and \d+? are prepared to adjust the number of digits they match in order to make the rest of the pattern match, (? \d+) can only match an entire sequence of digits.