POSIX extended Regular expression functions

1, Ereg () function and eregi () function

function Syntax:

　　BOOL Ereg/eregi (string pattern, string string [, array regs])

function function:

　　Matches the expression pattern in string strings and returns False if the match returns true successfully. If there is a 3rd argument regs, the successfully matched string is divided into substrings (sub-expressions) and stored in the regs array. Ereg are case-sensitive, while eregi are case-insensitive.

2, ereg_replace () function and eregi_replace () function

function Syntax:

　　String Ereg_replace/eregi_replace (string pattern, string replacement, string string)

function function:

　　Matches the expression pattern in string strings. If the match succeeds, the match string is replaced with replacement and the replaced string is returned. Eregi_replace () is case insensitive.

3. Split () function and Spliti () function

function Syntax:

　Array Split/spliti (string pattern, string string [, int limit])

function function:

　　Use the expression pattern to split string strings. If there is a parameter limit, the array has a maximum of limit elements, and the remainder is written to the last array element. Returns False if the function is wrong. The split () function is case-sensitive and the Spliti () function is case insensitive.

POSIX extended Regular expression functions