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Need Regex Expression for the following password conditions: 1 capital, 1 lower case, 1 special character, 1 numeric, no characters other then alphanumeric and special characters, minimum length of 8, max length of 30

varthdader
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    "no characters other then alphanumeric and special characters ... max length of 30" -- Why? Don't impose arbitrary password restrictions. – Tom Lord May 09 '18 at 09:36
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    What have you tried so far? What difficulty/errors have you encountered? StackOverflow is a place to ask questions about your code, not a place to get others to write it all for you. – Tom Lord May 09 '18 at 09:38
  • Can you come up with positive and negative examples? And then, at least something that doesn't work just yet. – Tamas Rev May 09 '18 at 10:12
  • You should read [Reference - Password Validation](https://stackoverflow.com/questions/48345922/reference-password-validation) – ctwheels May 30 '18 at 15:38

1 Answers1

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We can do it with lookaheads:

^(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*[+-_*%#!$/\\"'`])[a-zA-Z0-9+-_*%#!$/\\"'`]{4,30}$

Explanation:

  • ^[a-zA-Z0-9+-_*%#!$/\\"'``]{4,30}$ restricts the length and the type of characters
  • (?=....) is a lookahead
  • (?=.*[A-Z]) makes sure there is at lest one uppercase character
  • (?=.*[0-9]) makes sure there is at least one number
  • and so on, the other two lookaheads are for lower case chars and special chars

Demo here.

Tamas Rev
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