CODEWITHSUNDEEP
qtqregularexpression
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How to

Reputation: 103

QRegularExpression how i can get last matched word

(?i)time.?([0-9:]+) - this pattern find all texts - time=00:00:00.00

How i can get last matched element(time=00:05:01.84) in first or second text

First text:

Metadata:
      creation_time   : 2013-11-21 11:03:11
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Output #0, mp3, to 'ssdad.mp3':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    TSSE            : Lavf54.63.104
    Stream #0:0(und): Audio: mp3, 44100 Hz, stereo, fltp
    Metadata:
      creation_time   : 2013-11-21 11:03:11
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Stream mapping:
  Stream #0:1 -> #0:0 (aac -> libmp3lame)
Press [q] to stop, [?] for help
size=    3779kB time=00:03:01.84 bitrate= 128.0kbits/s
size=    3779kB time=00:04:01.84 bitrate= 128.0kbits/s
size=    3779kB time=00:05:01.84 bitrate= 128.0kbits/s
video:0kB audio:3779kB subtitle:0 global headers:0kB muxing overhead 0.008011%

Second text:

Metadata:
      creation_time   : 2013-11-21 11:03:11
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Output #0, mp3, to 'ssdad.mp3':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    TSSE            : Lavf54.63.104
    Stream #0:0(und): Audio: mp3, 44100 Hz, stereo, fltp
    Metadata:
      creation_time   : 2013-11-21 11:03:11
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Stream mapping:
  Stream #0:1 -> #0:0 (aac -> libmp3lame)
Press [q] to stop, [?] for help
size=    3779kB time=00:05:01.84 bitrate= 128.0kbits/s
video:0kB audio:3779kB subtitle:0 global headers:0kB muxing overhead 0.008011%

Upvotes: 0

Views: 476

Answers (1)

mcchu
mcchu

Reputation: 3369

To get the last matched element with QRegularExpression, you can use global match to obtain a QRegularExpressionMatchIterator and iterate it to the last element:

QString getLastTime(const QString &input)
{
    auto re = QRegularExpression { R"((?i)time.?([0-9:]+))" };
    auto matchIterator = re.globalMatch(input);
    while(matchIterator.hasNext())
    {
        auto result = matchIterator.next();
        if (!matchIterator.hasNext())
        {
            return result.captured(0);
        }
    }
    return QString{};
}

Alternatively, you can use QString::lastIndexOf with a QRegularExpression to get the last match:

QString getLastTime2(const QString &input)
{
    auto match = QRegularExpressionMatch{};
    input.lastIndexOf(QRegularExpression { R"((?i)time.?([0-9:]+))" }, -1, &match);
    return match.captured(0);
}

Upvotes: 1

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