$str=",31,24,33,23,55,99,111,312,453,99,";
没有必要有用正则表达式,用下面的程序就行if(substr($str,0,1)==",')
$str.=substr($str,1,strlen($str)-1);if(substr($str,strlent($str)-1,1)==',')$str.=substr($str,0,(strlen($str)-1));echo $str;这样就可以了呀
没有必要有用正则表达式,用下面的程序就行if(substr($str,0,1)==",')
$str.=substr($str,1,strlen($str)-1);if(substr($str,strlent($str)-1,1)==',')$str.=substr($str,0,(strlen($str)-1));echo $str;这样就可以了呀
^,|,$替换成:
(0长度字符串)测试工具:(推荐)
http://www.regexlab.com/zh/replshop.asp?pat=%5E%2C%7C%2C%24&rto=&txt=%2C31%2C24%2C33%2C23%2C55%2C99%2C111%2C312%2C453%2C99%2C更多帮助,推荐参考正则表达式入门文档:
http://www.regexlab.com/zh/regref.htm