Suggest a regex that matches a string with letters and (numbers or special characters)

Question

I am developing a sign-up page. In that, I want user to input password with the following format:

Example:

Valid inputs:

abc123 
123abc 
abc!@#
!@#abc

Invalid inputs:

abc
123    
!@#    
123!@#

My work:

((([A-Z]|[a-z]|[0-9])*)(([0-9])|([[\]{}\\|;:'"_+=!@#$%$%^&*()-,<\.>/\?`~])))

It matches only abc123 and abc!@#.

My Work ((([A-Z]|[a-z]|[0-9]))(([0-9])|([[]{}\|;:'"_+=!@#$%$%^&()-,<.>/\?`~]))) it matches only abc123,abc!@# — RagAnt, Feb 14 '18 at 10:36
Is `[A-Za-z](?=[[\]{}\\|;:'"_+=!@#$%$%^&*()-,<\.>/\?\`~0-9])|(?<=[[\]{}\\|;:'"_+=!@#$%$%^&*()-,<\.>/\?\`~0-9])[A-Za-z]` fine ? — Leyff da, Feb 14 '18 at 10:47
Although you can do this with a regular expression it is probably easier to just count how many letters, digits and specials you got. This would also allow more complicated rules (e.g at least 3 letters and 2 digits) — Henry, Feb 14 '18 at 10:51
@Leyffda .. When it tested it in regexr.com , it shows "positive lookbehind not supported in this flavor of regex " — RagAnt, Feb 14 '18 at 10:52
@anubhava .. Because the password must have both alphabets and numbers or special characters. Alphabets alone or numbers alone or special characters alone should be rejected — RagAnt, Feb 14 '18 at 10:55
@LordCommander Please take a look at [Reference - Password Validation](https://stackoverflow.com/questions/48345922/reference-password-validation/48346033#48346033) — ctwheels, Feb 14 '18 at 16:43

score 2 · Accepted Answer · answered Feb 14 '18 at 11:06

2

Did you try the following ?

((([a-zA-Z]+)([0-9#]+))|(([0-9#]+)([a-zA-Z]+)))[a-zA-Z0-9#]*

# being replaced by allowed special characters.

It mandates an alphabet and a special character or a number followed by any number of allowed characters

answered Feb 14 '18 at 11:06

Arun Gowda

1 Answers1