Possible Duplicates:
How can I convert ereg expressions to preg in PHP?
What is the equivalent using preg_replace to the following expression?
ereg_replace('^' . $g_lang_prefix, '', $t_var );
preg_replace('/^' . preg_quote($g_lang_prefix,'/') . '/', '', $t_var );
If you need $g_lang_prefix working as a common regex then omit preg_quote
preg_replace('/^' . $g_lang_prefix . '/', '', $t_var );
(quite obvious)
Also if you need this second solution, but your $g_lang can contain even this char / then you need to escape at least it:
preg_replace('/^' . str_replace('/','\/',$g_lang_prefix) . '/', '', $t_var );