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Bruno Sosa Fast Tag
Asked: 2022-09-30 07:01:59 +0800 CST 2022-09-30 07:01:59 +0800 CST

Java Regex Validations

  • 772

I have the following regular expression

^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$

Which validates that the expression has uppercase, lowercase and numbers,

What I haven't been able to add are optional special signs try with

^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]?[.]{8,}$

in theory the ?should be optional, I'm pretty new to this regex, I appreciate any help

java

2 Answers

  1. Best Answer

    To validate at least eight characters with at least one uppercase letter and special character you can use:

    ^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$

    You can use https://www.regextester.com/ to perform validation:

    enter image description here

    If you want the special characters to be optional, simply remove this part: (?=. [@$!% ?&]) from the previous REGEX and it would look like this:

    ^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[A-Za-z\d@$!%*?&]{8,}$

    enter image description here

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  2. I'm not very good with Regex I'm also a beginner but I hope this works

    ^(?=(?:.*\d){1})(?=(?:.*[A-Z]){1})(?=(?:.*[a-z]){1})(?=(?:.*[@$?¡\-_]){1})\S{8,16}$

    Check this page it can also help you (I hope it has been useful)

    Regex An Introduction

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