JavaScript regular expression for validating password field regular expression validation string,regular expression validation in javascript,regular

I am a learner in java script currently I am going through the regular expression for validating the password field, I want my password field to contain characters and only one number in any place of the string,

I tried the following regular expression it checks for at-least one number and one character in the string

^[A-Za-z0-9 _]*[A-Za-z0-9][A-Za-z0-9 _]*$

Can anyone help me!

Answer:1

All you need is adding a lookahead at the start:

^(?=\D*\d\D*$)[A-Za-z0-9 _]*[A-Za-z0-9][A-Za-z0-9 _]*$

The lookahead makes sure there is zero or more nondigits followed by a digit and zero or more nondigits up to the end of string. 

Answer:2

Use this RE

(?!^[0-9]$)(?!^[a-zA-Z]$)^([a-zA-Z0-9]{6,15})$

Answer:3

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