Question

Javascript regex to validate that it contains 6 characters and in which one character (1) should be a number.

var pwdregex  =/^[A-Za-z1-9]{6}$/;

Answer 1

This will guarantee exactly one number (i.e. a non-zero decimal digit):

var pwdregex = /^(?=.{6}$)[A-Za-z]*[1-9][A-Za-z]*$/;

And this will guarantee one or more consecutive number:

var pwdregex = /^(?=.{6}$)[A-Za-z]*[1-9]+[A-Za-z]*$/;

And this will guarantee one or more not-necessarily-consecutive number:

var pwdregex = /^(?=.{6}$)[A-Za-z]*(?:[1-9][A-Za-z]*)+$/;

All of the above expressions require exactly six characters total. If the requirement is six or more characters, change the {6} to {6,} (or remove the $ from {6}$).