Fix warnings related to ereg/eregi/ereg_match and split

components/blogfeed.php

components/contents.php

components/email.php

components/events.php

components/front.php

components/mw.php

components/projects.php

lib/blog/admin.lib.php

lib/blog/blog.lib.php

lib/blog/miscfunctions.lib.php

lib/blog/validation.lib.php

lib/sanitization.php

lib/session.php

lib/validation.php