How to verify password using regular expression in Go?

Here's how to use regular expressions to verify passwords in Go: Define a regular expression pattern that meets the minimum password requirements: at least 8 characters, including lowercase letters, uppercase letters, numbers, and special characters. Compile regular expression patterns using the MustCompile function from the regexp package. Use the MatchString method to test whether an input string matches a regular expression pattern.

#How to verify password using regular expression in Go?

Regular expressions are powerful tools for matching specific patterns within a body of text or a string. In Go, you can use the regexp package to verify that a string follows a specific pattern.

Required pattern to verify password

A common password verification pattern is as follows:

• At least 8 characters
• Contains at least one lowercase letter
• Contains at least one uppercase letter
• Contains at least one number
• Contains at least one special character

##Regular Expression pattern

To match this pattern, you can use the following regular expression:

^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[!@#$%^&*])[a-zA-Z0-9!@#$%^&*]{8,}$

Go program

The following Go program demonstrates How to verify password using regular expression:

package main

import (
   "fmt"
   "regexp"
)

func main() {
   // 定义正则表达式模式
   pattern := `^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[!@#$%^&*])[a-zA-Z0-9!@#$%^&*]{8,}$`
   r := regexp.MustCompile(pattern)

   // 测试输入字符串
   passwords := []string{"password1", "Password123", "MyPassword123"}
   for _, password := range passwords {
      if r.MatchString(password) {
         fmt.Printf("%s 是一个有效的密码。\n", password)
      } else {
         fmt.Printf("%s 不是一个有效的密码。\n", password)
      }
   }
}

output

password1 不是一个有效的密码。
Password123 不是一个有效的密码。
MyPassword123 是一个有效的密码。

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