通过分组获取正则表达式匹配项

huangapple
go评论124阅读模式
英文:

regexp get matches by group

问题

我想解析一个字符串并获取两个引号之间的子字符串

#subject

  1. query="tag1 tag2"

#pattern

  1. query="([a-z ]*)"

#result

  1. tag1 tag2

#code

  1. package main
  3. import (
  4.   "fmt"
  5.   "regexp"
  6. )
  8. var re = regexp.MustCompile(`query="([a-z ]*)"`)
  10. func main() {
  11.   match  := re.FindStringSubmatch(`query="tag1 tag2"`)
  12.   result := make(map[string]string)
  13.   for i, name := range re.SubexpNames() {
  14.      result[name] = match[i]
  15.   }
  16.   fmt.Printf("by name: %v\n", result)
  17. }

http://play.golang.org/p/voKpOlcc8J

#update

字符串

  1. query="tag1 tag2 tag3" foo="wee"

匹配结果
tag1 tag2 tag3

  1. package main
  3. import "fmt"
  4. import "regexp"
  6. func main() {
  7. 	var str string = `query="tag1 tag2 tag3" foo="wee"`
  8. 	re := regexp.MustCompile(`query="(([a-z0-9]+) ?)*"`)
  9. 	match := re.FindStringSubmatch(str)
  10. 	if len(match) == 0 {
  11. 		fmt.Print("no matches")
  12. 	} else {
  13. 		result := make(map[string]string)
  14. 		for i, name := range re.SubexpNames(){
  15. 			result[name] = match[i]
  16. 		}
  17. 		fmt.Print(result)
  18. 	}
  19. }

http://play.golang.org/p/8vieH4eDd1

英文:

I want to parse a string and get the substring inside two quotes

#subject

  1. query="tag1 tag2"

#pattern

  1. query="([a-z ]*)"

#result

  1. tag1 tag2

#code

  1. package main
  3. import (
  4.   "fmt"
  5.   "regexp"
  6. )
  8. var re = regexp.MustCompile(`query="([a-z ]*)"`)
  10. func main() {
  11.   match  := re.FindStringSubmatch(`query="tag1 tag2"`)
  12.   result := make(map[string]string)
  13.   for i, name := range re.SubexpNames() {
  14.      result[name] = match[i]
  15.   }
  16.   fmt.Printf("by name: %v\n", result)
  17. }

http://play.golang.org/p/voKpOlcc8J

#update

string

  1. query="tag1 tag2 tag3" foo="wee"

matches
tag1 tag2 tag3

  1. package main
  3. import "fmt"
  4. import "regexp"
  6. func main() {
  7. 	var str string = `query="tag1 tag2 tag3" foo="wee"`
  8. 	re := regexp.MustCompile(`query="(([a-z0-9]+) ?)*"`)
  9. 	match := re.FindStringSubmatch(str)
  10. 	if len(match) == 0 {
  11. 		fmt.Print("no matches")
  12. 	} else {
  13. 		result := make(map[string]string)
  14. 		for i, name := range re.SubexpNames(){
  15. 			result[name] = match[i]
  16. 		}
  17. 		fmt.Print(result)
  18. 	}
  19. }

http://play.golang.org/p/8vieH4eDd1

答案1

得分: 4

你可以提取整个标签字符串，然后使用Split()函数进行分割。

  1. package main
  3. import (
  4. 	"fmt"
  5. 	"regexp"
  6. 	"strings"
  7. )
  9. func main() {
  10. 	var str string = `query="tag1 tag2 tag3" foo="wee"`
  11. 	re := regexp.MustCompile(`query="(.+?)"`)
  12. 	match := re.FindStringSubmatch(str)
  14. 	if len(match) == 2 {
  15. 		fmt.Println(strings.Split(match[1], " "))
  16. 	}
  17. }

输出结果：[tag1 tag2 tag3]

英文:

You can extract the whole tag string and then Split() it.

  1. package main
  3. import (
  4. 	"fmt"
  5. 	"regexp"
  6. 	"strings"
  7. )
  9. func main() {
  10. 	var str string = `query="tag1 tag2 tag3" foo="wee"`
  11. 	re := regexp.MustCompile(`query="(.+?)"`)
  12. 	match := re.FindStringSubmatch(str)
  14. 	if len(match) == 2 {
  15. 		fmt.Println(strings.Split(match[1], " "))
  16. 	}
  17. }

Output: [tag1 tag2 tag3]

答案2

得分: 2

首先，该模式不会匹配数字。你可能想将其更改为：

  1. var re = regexp.MustCompile(`query="(.*)"`)

然后，为了获取子字符串，你可以使用FindStringSubmatch：

  1. match := re.FindStringSubmatch(`query="tag1 tag2"`)
  2. if len(match) == 2 {
  3.     fmt.Printf("Found: [%s]\n", match[1])
  4. } else {
  5.     fmt.Println("No match found", match)
  6. }

输出：

Found: [tag1 tag2]

然后，为了将字符串拆分为单独的标签，我建议使用strings.Split函数。

英文:

First off, the pattern will not match the digits. You might want to change it to:

  1. var re = regexp.MustCompile(`query="(.*)"`)

Then, in order to get the substring, you can just use FindStringSubmatch:

  1. match := re.FindStringSubmatch(`query="tag1 tag2"`)
  2. if len(match) == 2 {
  3. 	fmt.Printf("Found: [%s]\n", match[1])
  4. } else {
  5. 	fmt.Println("No match found", match)
  6. }

Output:

> Found: [tag1 tag2]

Then, in order to split the string into seperate tags, I recommend using strings.Split

答案3

得分: 0

正则表达式不接受数字，s/[a-z ]/[a-z0-9 ]/

http://play.golang.org/p/ov_zoxBenV

英文:

The regexp does not accept digits, s/[a-z ]/[a-z0-9 ]/

http://play.golang.org/p/ov_zoxBenV

huangapple
  • 本文由 发表于 2015年4月16日 16:54:55
  • 转载请务必保留本文链接：https://go.coder-hub.com/29669835.html
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