在Go中匹配段落

Question

我是Go初学者。我试图用regexp匹配的段落：

package main 

import (
    "fmt" 
    "regexp" 
) 

func main() { 
    str := `first paragraph 

second paragraph 

third paragraph` 

    r, _ := regexp.Compile(`(.+)(\n\n)`) 

    fmt.Println(r.FindAllString(str, -1)) 
} 

输出是这样的：

[first paragraph 

second paragraph 

] 

我认为它也匹配空行。我只想匹配段落（first paragraph,second paragraph）。

如何修改我的代码来完成该操作？

Answer 1

你可以试试，用re2-compliant regexp，(?s).*?(\n\n|$)（见playground example）：

package main 

import (
    "fmt" 
    "regexp" 
) 

func main() { 
    str := `first paragraph 
second line of first paragraph 

second paragraph 

third paragraph 
second line of third paragraph` 

    r, _ := regexp.Compile(`(?s).*?(\n\n|$)`) 

    res := r.FindAllString(str, -1) 
    fmt.Printf("%+v %d", res, len(res)) 
} 

这将输出：

[first paragraph 
second line of first paragraph 

second paragraph 

third paragraph 
second line of third paragraph] 3