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I wish to check if a password contains at least one letter and a number. special characters are accepted but not required...
That will be a simple password checker.
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To check whether a String contains only unicode letters or digits in Java, we use the isLetterOrDigit() method and charAt() method with decision-making statements. The isLetterOrDigit(char ch) method determines whether the specific character (Unicode ch) is either a letter or a digit.
In order to verify that the string only contains letters, numbers, underscores and dashes, we can use the following regex: "^[A-Za-z0-9_-]*$".
Letters can be checked in Python String using the isalpha() method and numbers can be checked using the isdigit() method.
It's called the coefficient. For example: 5x, the number 5 is the coefficient. For the letter x, Then the number 1 is understood to be the coefficient.
You can use lookahead assertions to check for existence of any digit and any letter as:
^(?=.*[a-zA-Z])(?=.*[0-9])
Using a single regex for this can lead to somewhat unreadable/unreliable code. It may make more sense to use simpler regexes eg [0-9] to check for the existence of a digit and break the requirements of your password strength checker into a multi-line if. Also this allows you to know more readily at what stage the validation failed and possibly make suggestions to the user.
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