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I need help to create a regex that filters the strings have at least one number, uppercase letter, one lowercase letter and ends with "@xyz.sd" I've tried that so far, 

(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z0-9@\.]{12,25}

This full fill all the conditions except the "@xyz.sd" part. I tried to do that by,

(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z0-9@\.]+(@xyz.sd){12,25}

But it does not work.

tontus
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  • Possible duplicate of [Regular Expression for password validation](https://stackoverflow.com/questions/5859632/regular-expression-for-password-validation) – Poul Bak Nov 28 '18 at 18:32

1 Answers1

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You may use another lookahead and you need to use anchors:

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*@xyz\.sd$)[a-zA-Z0-9@.]{12,25}$

Or better you can use this regex:

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z0-9@.]{5,18}@xyz\.sd$

Used quantifier range {5,18} instead of {12,25} as 7 characters will be consumed by @xyz.sd.

anubhava
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    First one also works but you need to select multiline flag. Though I would recommend using 2nd one. – anubhava Nov 28 '18 at 18:36