int  StringLen(
   string  string_value      // string
   );

void OnStart()
  {
//--- define the test string
   string text="123456789012345";
//--- get the number of symbols in the string
   int str_len=StringLen(text);
//--- display the string and the number of symbols in it in the log
   PrintFormat("The StringLen() function returned the value of %d chars in string: '%s'", str_len, text);

   /*
   Result
   The StringLen() function returned the value of 15 chars in string: '123456789012345'
   */
  }