Question

I’ll get some info from an user using textarea. But he can not type 3 consecutive white space characters, so i invested this code 😀

function trim(myString)
{
 str = myString;
 str = str.replace(/\s/g, " ");
 alert(str.lastIndexOf("   "));
 if (str.lastIndexOf("   ")>-1)
 {
  alert("At most 3 consecutive white Space is allowed !");
  return false;
 }
 return myString.replace(/^[\s]+/,'').replace(/[\s]+$/,'').replace(/[\s]{2,}/,' ');
}

but it does not work, can you help me correcting the error ?

The above code first replaces all types of white characters with a space, then it search for 3 consecutive white space, if it founds then it shows an alert !

You can also have a look at Allowing at most 2 newline in textarea

Answer 1

Try with this alternative, simplified version:

 function trim(str)
 {
      if (str.match(/\s\s\s+/))
      {
           alert("At most 3 consecutive white Space is allowed !");
           return false;
      }
     return str.replace(/\s\s\s+/g,' ');
 }