├── README.md
└── go
    ├── concurrency.go
    └── utils
        └── verifyPasswd.go


/README.md:
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1 | # classic-snippet
2 | 
3 | 
4 | 


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/go/concurrency.go:
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 1 | package main
 2 | 
 3 | import "fmt"
 4 | 
 5 | func main() {
 6 | 	var data int
 7 | 
 8 | 	go func() {
 9 | 		data++
10 | 	}()
11 | 
12 | 	if data == 0 {
13 | 		fmt.Println("the value is %v.\n", data)
14 | 	}
15 | 
16 | }


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/go/utils/verifyPasswd.go:
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 1 | package main
 2 | 
 3 | import (
 4 | 	"fmt"
 5 | )
 6 | 
 7 | func main() {
 8 | 
 9 | 	password := "cuAishuang"
10 | 
11 | 	rs := verifyPasswdIsLegal(password)
12 | 
13 | 	fmt.Println(rs)
14 | }
15 | 
16 | // 验证密码是否合法. 不使用正则,使用ascii码硬匹配方式,性能其实会比正则还要好一些
17 | func verifyPasswdIsLegal(passwd string) bool {
18 | 	if len(passwd) < 8 || len(passwd) > 48 {
19 | 		return false
20 | 	}
21 | 	uppercaseLetter := 0
22 | 	lowerLetter := 0
23 | 	symbol := 0
24 | 	for _, v := range passwd {
25 | 		switch {
26 | 		case v >= 33 && v <= 64:
27 | 			{
28 | 				symbol = 1
29 | 			}
30 | 		case v >= 65 && v <= 90:
31 | 			{
32 | 				uppercaseLetter = 1
33 | 			}
34 | 		case v >= 91 && v <= 96:
35 | 			{
36 | 				symbol = 1
37 | 			}
38 | 		case v >= 97 && v <= 122:
39 | 			{
40 | 				lowerLetter = 1
41 | 			}
42 | 		case v >= 123 && v <= 126:
43 | 			{
44 | 				symbol = 1
45 | 			}
46 | 		default:
47 | 			return false
48 | 		}
49 | 	}
50 | 	if uppercaseLetter+lowerLetter+symbol < 2 {
51 | 		return false
52 | 	}
53 | 	return true
54 | }
55 | 


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