freeBSD PHP issues

[kevin kempter]

Hi List;

I'm fairly new to freeBSD, but a long time Linux biggot. I installed  
freeBSD7, then I installed PHP like this:

# cd /usr/ports/lang/php5
# make config
# make install

Next I installed PostgreSQL and pgFouine

However when I run pgfouine to generate a log report I get this error:

$ php ./pgfouine.php -file $PGDATA/pg_log/postgresql-31.log > rept.html
PHP Fatal error:  Call to undefined function preg_replace() in /usr/ 
local/pgsql/pgfouine/include/reporting/geshi/geshi.php on line 474

preg_replace() I believe is a PHP built-in, anyone know how to correct  
this, or have thoughts on what I may be doing wrong. Maybe I've missed  
some sort of config step?

Thanks in advance...