What is the difference between ereg_replace() and eregi_replace()?

ereg_replace()->  Regular expression match replace case sensetive.  eregi_replace()-> Regular expression match replace case insensetive.

eregi_replace() function is identical to ereg_replace() except that it ignores case distinction when matching alphabetic characters.

ereg_replace() is case sensitive while eregi_replace() is not case sensitive.

ereg_replace() is a case sensitive whereas eregi_replace() is not case sensitive.

e.g.

ereg_replace() - "Hello" - cannot treat as "hello" whereas

eregi_replace() - "Hello" - can be treat as "hello"