(PHP 4, PHP 5) Case insensitive regular expression match

(PHP 4, PHP 5) Make regular expression for case insensitive match

(PHP 4, PHP 5) Split string into array by regular expression

(PHP 4, PHP 5) Replace regular expression case insensitive

(PHP 4 >= 4.0.1, PHP 5) Split string into array by regular expression case insensitive

(PHP 4, PHP 5) Regular expression match int ereg

(PHP 4, PHP 5) Replace regular expression string