regex - 在 Go 中匹配段落

Question

我是围棋初学者。我正在尝试将段落与 regexp 匹配:

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(第一段，第二段)。

如何修改我的代码来完成它？

Answer 1

您可以尝试使用 re2-compliant regexp , (?s).*?(\n\n|$)(参见 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))
}

那会输出:

[first paragraph
second line of first paragraph

 second paragraph

 third paragraph
second line of third paragraph] 3