How to Validate Passwords with Regexp in Go?

Password Validation with Regexp in Go

Regex expression patterns are a powerful tool for validating user input, including passwords. In Go, the regex package provides a different approach compared to other languages. However, constructing a regex pattern for password validation is straightforward.

To validate a password that meets the following criteria:

• at least 7 letters
• at least 1 number
• at least 1 upper case
• at least 1 special character

we can create a custom function to verify these requirements:

<code class="go">func verifyPassword(s string) (sevenOrMore, number, upper, special bool) {
    letters := 0
    for _, c := range s {
        switch {
        case unicode.IsNumber(c):
            number = true
        case unicode.IsUpper(c):
            upper = true
            letters++
        case unicode.IsPunct(c) || unicode.IsSymbol(c):
            special = true
        case unicode.IsLetter(c) || c == ' ':
            letters++
        default:
            //return false, false, false, false
        }
    }
    sevenOrMore = letters >= 7
    return
}</code>

This function iterates through the password string and checks each character for its type (number, uppercase, etc.). It also keeps track of the total number of letters. By combining these checks, we can determine if the password meets all the specified criteria.

The above is the detailed content of How to Validate Passwords with Regexp in Go?. For more information, please follow other related articles on the PHP Chinese website!