Optimal Regex?

I need to catch all instances of a coordinate in a give string. So far I have this, which only works if the coordinate is in a certain format. $string = (334,-53.44),(111,222); $expression = '([(][-]?[0-9]*[.0-9]*?,[-]?[0-9]*[.0-9]*?[)])'; preg_match_all($expression, "$string", $matches); This returns the correct strings (334,-53.44) and (111,222), but I'd like all formats to work. Like (111, 222), ( 111 , 222 ), (111, 222 ), etc, etc. How would I change my regex to accomplish this? -- David Pollack DHPollack@gmail.com www.atlspecials.com <http://www.atlspecials.com> www.da3.net <http://www.da3.net>