How to match in a single/common Regex Group matching or based on a condition-CodePudding

I would like to extract two different test strings /i/int/2021/11/18/019e1691-614c-4402-a8c1-d0239ad1ac45/,640-1_999899,480-1_999899,960-1_999899,1280-1_999899,1920-1_999899,.mp4.csmil/master.m3u8?set-segment-duration=responsive and

/i/int/2021/11/25/,live_20211125_215206_sendeton_640x360-50p-1200kbit,live_20211125_215206_sendeton_480x270-50p-700kbit,live_20211125_215206_sendeton_960x540-50p-1600kbit,live_20211125_215206_sendeton_1280x720-50p-3200kbit,live_20211125_215206_sendeton_1920x1080-50p-5000kbit,.mp4.csmil/master.m3u8

with a single RegEx and in Group-1.

By using this RegEx ^.[i,na,fm,d] \/(. ([,\/])?(\/|. =. ,\/). \/[,](live.([^,]).). _)?. (640).*$ I can get the second string to match the desired result int/2021/11/25/,live_20211125_215206_

but the first string does not match in Group-1 and the missing expected test string 1 extraction is int/2021/11/18/019e1691-614c-4402-a8c1-d0239ad1ac45

Any pointers on this is appreciated.

Thanks!

CodePudding user response：

We can't know all the rules of how the strings your are matching are constructed, but for just these two example strings provided:

package main

import (
    "fmt"
    "regexp"
)

func main() {
    var re = regexp.MustCompile(`(?m)(\/i/int/\d{4}/\d{2}/\d{2}/.*)(?:\/,|_[\w_] )640`)
    var str = `
/i/int/2021/11/18/019e1691-614c-4402-a8c1-d0239ad1ac45/,640-1_999899,480-1_999899,960-1_999899,1280-1_999899,1920-1_999899,.mp4.csmil/master.m3u8?set-segment-duration=responsive
/i/int/2021/11/25/,live_20211125_215206_sendeton_640x360-50p-1200kbit,live_20211125_215206_sendeton_480x270-50p-700kbit,live_20211125_215206_sendeton_960x540-50p-1600kbit,live_20211125_215206_sendeton_1280x720-50p-3200kbit,live_20211125_215206_sendeton_1920x1080-50p-5000kbit,.mp4.csmil/master.m3u8`

    match := re.FindAllStringSubmatch(str, -1)

    for _, val := range match {
        fmt.Println(val[1])
    }
}

CodePudding user response：

If you want both values in group 1, you can use:

^/(?:[id]|na|fm)/([^/\s]*/\d{4}/\d{2}/\d{2}/\S*?)(?:/,|[^_] _)640(?:\D|$)

The pattern matches:

^ Start of string
/ Match literally
(?:[id]|na|fm) Match one of i d na fm
/ Match literally
( Capture group 1
- [^/\s]*/ Match any char except a / or a whitespace char, then match /
- \d{4}/\d{2}/\d{2}/ Match a date like pattern
- \S*? Match optional non whitespace chars, as few as possible
) Close group 1
(?:/,|[^_] _) Match either /, or 1 chars other than _ and then match _
640 Match literally
(?:\D|$) Match either a non digits or assert end of string

See a regex demo and a go demo.