【www.gdgbn.com--php函数】

在验证域名时要适合的是域名中只能包含字母、数字和"-"字符！并且不能以"-"字符开头,用正则来判断就是/[^a-z0-9-]+/gi; /^-/;re = /-$/;如果是中文域名就re = /^[a-za-z0-9-u4e00-u9fa5ufe30-uffa0]+$/g这样验证

if ( ! fn_checkdomainnameonly ( theelement.value ) )
  {
   alert ( """ + theelementname + ""中只能包含字母、数字和"-"字符！并且不能以"-"字符开头！" ) ;
   theelement.focus ( ) ;
   return false ;
  }
  return true ;
}

function fn_checkdomainname ( strdomainname )
 {
  strdomainname = trimstring ( strdomainname ) ;
  
  arrayofstrings = strdomainname.split(".");
  if ( arrayofstrings.length < 2 )
  {
   return (false); // no enough parts
  }
  for(i=0;i   {
   str = trimstring(arrayofstrings[i]);
   if(str.length==0)
   {
    return (false);  // empty part
   }
 
   re1 = /[^a-z0-9-]+/gi;  
   match=re1.test(str);
   if ( match )
    return (false);  // non digit and character and "-" char
   re1 = /^-/;
   match=re1.test(str);
   if ( match )
    return (false);  // start with "-"
   re1 = /-$/;
   match=re1.test(str);
   if ( match )
    return (false);  // end with "-"
  }
  return (true);
 }

中文验证

function fn_checkcndomainname ( strdomainname )
 {
  strdomainname = trimstring ( strdomainname ) ;
  
  arrayofstrings = strdomainname.split(".");
  if ( arrayofstrings.length < 2 )
  {
   return (false); // no enough parts
  }
  for(i=0;i   {
   str = trimstring(arrayofstrings[i]);
   // must not exceed 20 chars
    if( str.length==0 || str.length > 20)
    {
     return (false);
    }
  
    // with only leagal chars
    re = /^[a-za-z0-9-u4e00-u9fa5ufe30-uffa0]+$/g
    if ( ! re.test(str) )
    {
     return (false);
    }
    // must with a chinese char at least
//    re = /^[a-za-z0-9-]+$/g
//    if ( re.test(str) )
//    {
//     return (false);
//    }
    // must not start with "-"
    re = /^-/;
    if ( re.test(str) )
     return (false);
    // must not end with "-"
    re = /-$/;
    if ( re.test(str) )
     return (false);
  }
  return (true);
 }

本文来源：http://www.gdgbn.com/jiaocheng/28802/