how to use eregi_replace

[Anon]

Does anybody know how to use the function eregi_replace in order to remove the substring "..\" or "../" from a string

for example from the string

....\dir1\dir11\file1.html

I want the string :
dir1\dir11\file1.html

[cordex]

$newpath_st = eregi_replace("(../)|(..\)","",$path_st);