如何以这种方式拆分字符串?

huangapple go评论100阅读模式
英文:

How to split the string in such way?

问题

我需要将类似于"aa bb cc dd ee ff"的字符串在Golang中拆分为:

["aa bb" "bb cc" "cc dd" "dd ee" "ee ff"]

我尝试了以下代码:

re := regexp.MustCompile("[a-z]+\s+[a-z]+")
fmt.Printf("%q\n", re.FindAllString("aa bb cc dd ee ff", -1))

但是它返回的结果是:

["aa bb" "cc dd" "ee ff"]

英文:

I need to split a string like "aa bb cc dd ee ff" in golang to

["aa bb" "bb cc" "cc dd" "dd ee" "ee ff"]

I'm trying this:

re := regexp.MustCompile("[a-z]+\\s+[a-z]+")
fmt.Printf("%q\n", re.FindAllString("aa bb cc dd ee ff", -1))

But it returns:

["aa bb" "cc dd" "ee ff"]

答案1

得分: 2

例如,

package main

import (
    "fmt"
    "strings"
)

func pairs(s string) []string {
    var p []string
    fs := strings.Fields(s)
    if len(fs) >= 2 {
        p = make([]string, 0, len(fs)-1)
        for i, f := range fs[1:len(fs)] {
            p = append(p, fs[i]+" "+f)
        }
    }
    return p
}

func main() {
    s := "aa bb cc dd ee ff"
    fmt.Printf("%q\n", s)
    p := pairs(s)
    fmt.Printf("%q\n", p)
}

输出:

"aa bb cc dd ee ff"
["aa bb" "bb cc" "cc dd" "dd ee" "ee ff"]
英文:

For example,

package main

import (
	"fmt"
	"strings"
)

func pairs(s string) []string {
	var p []string
	fs := strings.Fields(s)
	if len(fs) >= 2 {
		p = make([]string, 0, len(fs)-1)
		for i, f := range fs[1:len(fs)] {
			p = append(p, fs[i]+" "+f)
		}
	}
	return p
}

func main() {
	s := "aa bb cc dd ee ff"
	fmt.Printf("%q\n", s)
	p := pairs(s)
	fmt.Printf("%q\n", p)
}

Output:

"aa bb cc dd ee ff"
["aa bb" "bb cc" "cc dd" "dd ee" "ee ff"]

答案2

得分: 0

你忘了说这是一个重复模式:

([a-z]+\\s+[a-z]+)*

解决方案((?=([a-z]{2}\s+[a-z]{2})*))需要使用前瞻,但是Go语言中不可用

英文:

<strike>
You forget to say that it's a repeating pattern:

([a-z]+\\s+[a-z]+)*

</strike>


The solution ((?=([a-z]{2}\s+[a-z]{2})*)) needs lookahead which is not available in go

答案3

得分: 0

你可以使用bufio.Scanner进行迭代:

package main

import (
   "bufio"
   "strings"
)

func abc(data []byte, eof bool) (int, []byte, error) {
   if eof {
      return 0, nil, nil
   }
   a := -1
   for b, c := range data {
      if c == ' ' {
         if a >= 0 {
            return a+1, data[:b], nil
         }
         a = b
      }
   }
   return len(data), data, nil
}

func main() {
   s := bufio.NewScanner(strings.NewReader("aa bb cc dd ee ff"))
   s.Split(abc)
   for s.Scan() {
      println(s.Text())
   }
}

https://golang.org/pkg/bufio#Scanner.Split

英文:

You can iterate with a bufio.Scanner:

package main

import (
   &quot;bufio&quot;
   &quot;strings&quot;
)

func abc(data []byte, eof bool) (int, []byte, error) {
   if eof {
      return 0, nil, nil
   }
   a := -1
   for b, c := range data {
      if c == &#39; &#39; {
         if a &gt;= 0 {
            return a+1, data[:b], nil
         }
         a = b
      }
   }
   return len(data), data, nil
}

func main() {
   s := bufio.NewScanner(strings.NewReader(&quot;aa bb cc dd ee ff&quot;))
   s.Split(abc)
   for s.Scan() {
      println(s.Text())
   }
}

https://golang.org/pkg/bufio#Scanner.Split

huangapple
  • 本文由 发表于 2015年9月25日 22:32:54
  • 转载请务必保留本文链接:https://go.coder-hub.com/32784549.html
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