英文:
Matching paragraphs in Go
问题
我是你的中文翻译助手，以下是翻译好的内容：
我是一个Go语言的初学者。我正在尝试使用regexp来匹配段落：
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))
}
输出结果如下：
[first paragraph
second paragraph
]
我认为它也匹配了空行。我只想匹配段落（first paragraph，second paragraph）。
如何修改我的代码以实现这一目标？
英文:
I'm a Go beginner. I'm trying to match paragraphs with regexp:
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))
}
The output is this:
[first paragraph
second paragraph
]
I think it's matching the empty lines also. I only want to match the paragraphs (first paragraph, second paragraph).
How to modify my code to accomplish that?
答案1
得分: 1
你可以尝试使用符合re2规范的正则表达式(?s).*?(\n\n|$)（参见playground示例）：
package main
import (
"fmt"
"regexp"
)
func main() {
str := `first paragraph
second line of first paragraph
second paragraph
third paragraph
second line of third paragraph`
r, _ := regexp.Compile(`(?s).*?(\n\n|$)`)
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
英文:
You can try, using a re2-compliant regexp, (?s).*?(\n\n|$) (see playground example):
package main
import (
"fmt"
"regexp"
)
func main() {
str := `first paragraph
second line of first paragraph
second paragraph
third paragraph
second line of third paragraph`
r, _ := regexp.Compile(`(?s).*?(\n\n|$)`)
res := r.FindAllString(str, -1)
fmt.Printf("%+v %d", res, len(res))
}
That would output:
[first paragraph
second line of first paragraph
second paragraph
third paragraph
second line of third paragraph] 3
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