get first five chars of string js code example

Example 1: js only first 50 letters

'Hiya how are you'.substring(0,50);

Example 2: js substring first 4 numbwe

mystring = "9862 ....... -pack size 1 - SST Unspun Label (Roll) CAT#: 9862";

mystring = mystring.substring(0, 4);

alert(mystring.trim());