PHP ereg vs. preg

Question

I have noticed in the PHP regex library there is a choice between ereg and preg. What is the difference? Is one faster than the other and if so, why isn\'t the slower one d

Answer 1

preg is the Perl Compatible Regex library
ereg is the POSIX complient regex library

They have a slightly diffrent syntax and preg is in some cases slightly faster. ereg is deprecated (and it is removed in php6) so I wouldn't recommend that it is used.