RegEx PowerShell匹配

Question

我有以下网站http://www.shazam.com/charts/top-100/australia显示歌曲,我想用RegEx和PowerShell捕捉歌曲.下面的PowerShell代码是我到目前为止的代码:

    $ie = New-Object -comObject InternetExplorer.Application
    $ie.navigate('http://www.shazam.com/charts/top-100/australia')
    Start-Sleep -Seconds 10
    $null = $ie.Document.body.innerhtml -match 'data-chart-position="1"(.|\n)*data-track-title=.*content="(.*)"><a href(.|\n)*data-track-artist=\W\W>(.|\n)*<meta\scontent="(.*)"\sitemprop';$shazam01artist = $matches[5];$shazam01title = $matches[2]

数据图表位置

数据轨道标题

数据跟踪艺术家

列出的每首歌曲都有3个值(上图)与每个歌曲相关联,我想根据不同的图表位置(数字)捕捉每首歌曲的艺术家和标题.所以正则表达式找到实际的图表位置,然后是尾随的艺术家和标题.

如果我单独为艺术家和标题(下面的代码)运行RegEx,它会找到它们,但它只找到第一个艺术家和标题.我需要根据不同的图表位置找到每首歌曲的艺术家和标题.

$null = $ie.Document.body.innerhtml -match 'data-track-artist=\W\W>(.|\n)*<meta\scontent="(.*)"\sitemprop';$shazam01artist = $matches[2]
$null = $ie.Document.body.innerhtml -match 'data-track-title=.*content="(.*)"><a href';$shazam01title = $matches[1]
$shazam01artist
$shazam01title

Answer 1

使用正则表达式来解析部分HTML是绝对的噩梦,您可能想重新考虑这种方法.

Invoke-WebRequest返回一个名为的属性ParsedHtml,该属性包含对预解析的HTMLDocument对象的引用.使用它代替:

# Fetch the document
$Top100Response = Invoke-WebRequest -Uri 'http://www.shazam.com/charts/top-100/australia'

# Select all the "article" elements that contain charted tracks
$Top100Entries = $Top100Response.ParsedHtml.getElementsByTagName("article") |Where-Object {$_.className -eq 'ti__container'}

# Iterate over each article
$Top100 = foreach($Entry in $Top100Entries){
    $Properties = @{
        # Collect the chart position from the article element
        Position = $Entry.getAttribute('data-chart-position',0)
    }

    # Iterate over the inner paragraphs containing the remaining details
    $Entry.getElementsByTagName('p') |ForEach-Object {
        if($_.className -eq 'ti__artist') {
            # the ti__artist paragraph contains a META element that holds the artist name
            $Properties['Artist'] = $_.getElementsByTagName('META').item(0).getAttribute('content',0)
        } elseif ($_.className -eq 'ti__title') {
            # the ti__title paragraph stores the title name directly in the content attribute
            $Properties['Title']  = $_.getAttribute('content',0) 
        }
    }

    # Create a psobject based on the details we just collected
    New-Object -TypeName psobject -Property $Properties
}

现在,让我们看看Tay-Tay如何做到:

PS C:\> $Top100 |Where-Object { $_.Artist -match "Taylor Swift" }

Position           Title             Artist
--------           -----             ------
42                 Bad Blood         Taylor Swift Feat. Kendrick Lamar

甜!