In Golang How to generate a random string of random length within range without integers

huangapple
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英文:

In Golang How to generate a random string of random length within range without integers

问题

我尝试使用正则表达式从生成的字符串中删除整数，但这样做不能给我所需范围内的长度（很多长度会小于最小值）。

  1. package main
  3. import (
  4. 	"fmt"
  5. 	"log"
  6. 	"math/rand"
  7. 	"regexp"
  8. 	"time"
  9. )
  11. func randomString(length int) string {
  12. 	rand.Seed(time.Now().UnixNano())
  13. 	b := make([]byte, length)
  14. 	rand.Read(b)
  15. 	return fmt.Sprintf("%x", b)[:length]
  16. }
  17. func randomLength(minL, maxL int) int {
  18. 	rand.Seed(time.Now().UnixNano())
  20. 	return rand.Intn(maxL-minL) + minL
  21. }
  23. func main() {
  24. 	reg, err := regexp.Compile("[^a-zA-Z]+")
  25. 	if err != nil {
  26. 		log.Fatal(err)
  27. 	}
  29. 	for i := 0; i < 10; i++ {
  30. 		processedString := reg.ReplaceAllString(randomString(randomLength(8, 16)), "")
  31. 		println(processedString)
  33. 	}
  35. }

编辑：
当我搜索问题时，我错过了详细的@icza在那个问题中的回答。这里是他的回答。

英文:

I tried to remove the integer from the generated string with regex but this will not give me the length within the range required( many will be less than the minimum )

  1. package main
  3. import (
  4. 	&quot;fmt&quot;
  5. 	&quot;log&quot;
  6. 	&quot;math/rand&quot;
  7. 	&quot;regexp&quot;
  8. 	&quot;time&quot;
  9. )
  11. func randomString(length int) string {
  12. 	rand.Seed(time.Now().UnixNano())
  13. 	b := make([]byte, length)
  14. 	rand.Read(b)
  15. 	return fmt.Sprintf(&quot;%x&quot;, b)[:length]
  16. }
  17. func randomLength(minL, maxL int) int {
  18. 	rand.Seed(time.Now().UnixNano())
  20. 	return rand.Intn(maxL-minL) + minL
  21. }
  23. func main() {
  24. 	reg, err := regexp.Compile(&quot;[^a-zA-Z]+&quot;)
  25. 	if err != nil {
  26. 		log.Fatal(err)
  27. 	}
  29. 	for i := 0; i &lt; 10; i++ {
  30. 		processedString := reg.ReplaceAllString(randomString(randomLength(8, 16)), &quot;&quot;)
  31. 		println(processedString)
  33. 	}
  35. }

Edit:
when I searched for the question I missed detailed @icza answer in that question.

答案1

得分: 3

  1. var seededRand = rand.New(rand.NewSource(time.Now().UnixNano()))
  3. func StringWithCharset(length int, charset string) string {
  4.     b := make([]byte, length)
  5.     for i := range b {
  6.         b[i] = charset[seededRand.Intn(len(charset)-1)]
  7.     }
  8.     return string(b)
  9. }
  11. func main() {
  12.     rangeStart := 0
  13.     rangeEnd := 10
  14.     offset := rangeEnd - rangeStart
  15.     randLength := seededRand.Intn(offset) + rangeStart
  17.     charSet := "aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ"
  18.     randString := StringWithCharset(randLength, charSet)
  19. }
  1. var seededRand = rand.New(rand.NewSource(time.Now().UnixNano()))
  3. func StringWithCharset(length int, charset string) string {
  4.     b := make([]byte, length)
  5.     for i := range b {
  6.         b[i] = charset[seededRand.Intn(len(charset)-1)]
  7.     }
  8.     return string(b)
  9. }
  11. func main() {
  12.     rangeStart := 0
  13.     rangeEnd := 10
  14.     offset := rangeEnd - rangeStart
  15.     randLength := seededRand.Intn(offset) + rangeStart
  17.     charSet := "aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ"
  18.     randString := StringWithCharset(randLength, charSet)
  19. }
英文: 
  1. var seededRand = rand.New(rand.NewSource(time.Now().UnixNano()))
  3. func StringWithCharset(length int, charset string) string {
  4.     b := make([]byte, length)
  5.     for i := range b {
  6.         b[i] = charset[seededRand.Intn(len(charset)-1)]
  7.     }
  8.     return string(b)
  9. }
  11. func main() {
  12.     rangeStart := 0
  13.     rangeEnd := 10
  14.     offset := rangeEnd - rangeStart
  15.     randLength := seededRand.Intn(offset) + rangeStart
  17.     charSet := &quot;aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ&quot;
  18.     randString := StringWithCharset(randLength, charSet)
  19. }

答案2

得分: 1

你只需要定义你正在使用的字母表。类似以下的方式（你可以在Go Playground中进行调试）。

  1. package main
  3. import (
  4. 	"fmt"
  5. 	"math/rand"
  6. 	"strings"
  7. 	"time"
  8. )
  10. func main() {
  12. 	rand.Seed(time.Now().UnixNano())
  14. 	var alphabet []rune = []rune("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")
  16. 	rs := randomString(20, alphabet)
  17. 	fmt.Printf("这是相当随机的字符串：%s\n", rs)
  19. }
  21. func randomString(n int, alphabet []rune) string {
  23. 	alphabetSize := len(alphabet)
  24. 	var sb strings.Builder
  26. 	for i := 0; i < n; i++ {
  27. 		ch := alphabet[rand.Intn(alphabetSize)]
  28. 		sb.WriteRune(ch)
  29. 	}
  31. 	s := sb.String()
  32. 	return s
  33. }
英文:

You just need to define the alphabet that you're using. Something like the following (You can fiddle with it here in the Go Playground).

  1. package main
  3. import (
  4.   &quot;fmt&quot;
  5.   &quot;math/rand&quot;
  6.   &quot;strings&quot;
  7.   &quot;time&quot;
  8. )
  10. func main() {
  12.   rand.Seed(time.Now().UnixNano())
  14.   var alphabet []rune = []rune(&quot;ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz&quot;)
  16.   rs := randomString(20, alphabet)
  17.   fmt.Printf(&quot;This is pretty random: %s\n&quot;, rs)
  19. }
  21. func randomString(n int, alphabet []rune) string {
  23.   alphabetSize := len(alphabet)
  24.   var sb strings.Builder
  26.   for i := 0; i &lt; n; i++ {
  27.     ch := alphabet[rand.Intn(alphabetSize)]
  28.     sb.WriteRune(ch)
  29.   }
  31.   s := sb.String()
  32.   return s
  33. }

huangapple
  • 本文由 发表于 2022年3月16日 02:04:39
  • 转载请务必保留本文链接：https://go.coder-hub.com/71486991.html
  • go
  • random
  • string
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