Something

var strA = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";var strB = "abcdefghijklmnopqrstuvwxyz";var strC = "1234567890";var strD = "-_";var str = strA + strB + strC + strD;var qfr = '/' + 'a' + '/';var pattern = /a/;// would like to use it as var pattern = / variable /;// how would i do that;var result = str.match(pattern);for(i = 0; i < result.length; i++) {  return true;} else {  return false;}