Why the the following multiline regex do not work, I expect to match the substring inside the tags. Other simples multiline matches worked correctly.
func main() {
r := regexp.MustCompile(`(?m)<think>(.*)</think>`)
const s = `That is
<think>
FOOBAR
</think>`
fmt.Printf("%#v\n", r.FindStringSubmatch(s))
}
https://play.golang.org/p/8C6u_0ca8w
By default, "." doesn't match newline. If you give the "s" flag, it does. I don't think you need "m".
Note that if there are multiple <think>...</think>
in your string, the regexp will match everything between the first <think>
and the last </think>
. Using .*?
will cause it to only match the contents of the first one.
Do not use regexp to parse XML, instead use encoding/xml. Example of a corner-case which is impossible to handle in regexp: <think><elem attrib="I'm pondering about </think> tag now"></elem></think>
I'll use START
and STOP
as markers, just to disassociate from any XML stuff. Complete example (includes both LF and CRLF line endings, just in case) with a link to The Go Playground:
package main
import (
"fmt"
"regexp"
)
func main() {
r := regexp.MustCompile(`(?s)START(.*?)STOP`)
const s = "That is \nSTART\nFOOBAR\r\n\r\nSTOP\n"
fmt.Printf("%#v\n", r.FindStringSubmatch(s))
}
returns:
[]string{"START\nFOOBAR\r\n\r\nSTOP", "\nFOOBAR\r\n\r\n"}
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