如果在 n 行之前找到其他字符串，则 php regex 查找字符串

Question

我正在尝试将 mkvinfo 输出中的每一种音频和字幕语言都放入数组中，我已经尝试了各种谷歌搜索和 RegExr 上的正则表达式组合，但没有成功。我的源字符串是

| + Muxing application: libmkv 0.6.5

| + Writing application: HandBrake rev5474

| + Timecode scale: 1000000

| + Duration: 6788.031s (01:53:08.031)

|+ Segment tracks

| + A track

|  + Track number: 1 (track ID for mkvmerge & mkvextract: 0)

|  + Track UID: 718870071

|  + Track type: video

|  + Lacing flag: 0

|  + Codec ID: V_MPEG4/ISO/AVC

|  + CodecPrivate, length 45 (h.264 profile: High @L3.1)

|  + Default duration: 41.708ms (23.976 frames/fields per second for a video track)

|  + Default flag: 1

|  + MinCache: 1

|  + Video track

|   + Pixel width: 1280

|   + Pixel height: 536

|   + Display width: 1280

|   + Display height: 536

| + A track

|  + Track number: 2 (track ID for mkvmerge & mkvextract: 1)

|  + Track UID: 1000053498

|  + Track type: audio

|  + Lacing flag: 0

|  + Codec ID: A_AAC

|  + CodecPrivate, length 2

|  + Language: fre

|  + Default flag: 1

|  + Audio track

|   + Sampling frequency: 48000

|   + Channels: 2

| + A track

|  + Track number: 3 (track ID for mkvmerge & mkvextract: 2)

|  + Track UID: 1097600287

|  + Track type: audio

|  + Lacing flag: 0

|  + Codec ID: A_AAC

|  + CodecPrivate, length 2

|  + Language: eng

|  + Default flag: 0

|  + Audio track

|   + Sampling frequency: 48000

|   + Channels: 2

| + A track

|  + Track number: 4 (track ID for mkvmerge & mkvextract: 3)

|  + Track UID: 1976675274

|  + Track type: subtitles

|  + Lacing flag: 0

|  + Codec ID: S_TEXT/UTF8

|  + Language: fre

|  + Default flag: 0

| + A track

|  + Track number: 5 (track ID for mkvmerge & mkvextract: 4)

|  + Track UID: 1930079859

|  + Track type: subtitles

|  + Lacing flag: 0

|  + Codec ID: S_TEXT/UTF8

|  + Language: fre

|  + Default flag: 0

|+ Cluster

使用正则表达式Language:\s([a-z]+)我可以获得所有音频和字幕

Language: fre

Language: eng

Language: fre

Language: fre

理想的输出是

Array

(

    [audio] => Array

        (

            [0] => eng

            [1] => fre

        )

    [subtitles] => Array

        (

            [0] => fre

            [1] => fre

        )

)

任何帮助将不胜感激，提前致谢，最好

Answer 1

您可以使用交替来匹配 2 个捕获组中的任一值，并使用点匹配换行符(?s)然后，您可以使用组 1 作为键来组装结果数组，并将组 2 的值添加到组 1 键。(?s)\+\h+Track type:\h+(audio|subtitles)\b.*?\+\h+Language:\h+([a-z]+)例如preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);$result = [];foreach ($matches as $match) {    $result[$match[1]][] = $match[2];}print_r($result);输出Array(    [audio] => Array        (            [0] => fre            [1] => eng        )    [subtitles] => Array        (            [0] => fre            [1] => fre        ))不需要的更精确的模式可以(?s)匹配Track type:和匹配所有不以 A track 或 Language 开头的行：^\|\h+\+\h+Track type:\h+(audio|subtitles)(?:\R(?!\|\h+\+\h+(?:[A-Z] track$|Language:)).*)*\R\|\h+\+ Language:\h+([a-z]+)