(PHP 4 >= 4.3.0, PHP 5, PHP 7) Make a string uppercase

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Returns start point for next regular expression match

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Split multibyte string using regular expression

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Decode string in MIME header field

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Decode HTML numeric string reference to character

(PHP 5 >= 5.3.0, PHP 7) Get aliases of a known encoding type

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Set/Get the default options for mbregex functions

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Get MIME charset string

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Retrieve the result from the last multibyte regular expression match

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Replace regular expression with multibyte support ignoring case