<html><head><title>Untitled</title></head><body><?php$in="2344";if(ereg("^(-{0,1}|+{0,1})[0-9]+(.{0,1}[0-9]+)$",$in))echo "Ok!";elseecho "Sorry,Please input again!";?><br>很简单的嘛！</body></html>
<html><head><title>Untitled</title></head><body><?php$in="2344";if(ereg("^(-{0,1}|+{0,1})[0-9]+(.{0,1}[0-9]+)$",$in))echo "Ok!";elseecho "Sorry,Please input again!";?><br>很简单的嘛！</body></html>