<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!"; else echo "Sorry,Please input again!"; ?> <br>很简单的嘛! </body> </html>
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