Voglio un'espressione regolare per estrarre il titolo da una pagina HTML. Attualmente ho questo:
title = re.search('<title>.*</title>', html, re.IGNORECASE).group()
if title:
title = title.replace('<title>', '').replace('</title>', '')
C'è un'espressione regolare per estrarre solo il contenuto di
quindi non c'è bisogno di rimuovere i tag? </P> </div>
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<p class="title" style="background-color:green;">
<i class="far fa-thumbs-up"></i> Soluzione </p>
<div class="testo">
<P> <code>(</code> Usa <code>)</code> in regexp e <a href="https://docs.python.org/2/library/re.html#re.MatchObject.group" rel="noreferrer"> <code>group(1)</code> </a> python per recuperare la stringa catturata (<a href="https://docs.python.org/2/library/re.html#re.search" rel="noreferrer"> <code>re.search</code> </a> tornerà <code>None</code> se non trova il risultato, in modo da <em> non utilizzare <code>group()</code> direttamente </em>): </p>
<pre><code>title_search = re.search('<title>(.*)</title>', html, re.IGNORECASE)
if title_search:
title = title_search.group(1)
</code></pre> </div>
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<p class="title" style="background-color:black;"><i class="fas fa-file-alt"></i> Altri suggerimenti</p>
<div class="testo">
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<P> Provare a utilizzare gruppi di cattura: </p>
<pre><code>title = re.search('<title>(.*)</title>', html, re.IGNORECASE).group(1)
</code></pre> </div>
</div>
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<i class="far fa-newspaper fa-2x mb-2" style="display:block;color:gray;"></i>
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<P> Si noti che a partire <code>Python 3.8</code>, e l'introduzione di <a href="https://www.python.org/dev/peps/pep-0572/" espressioni di assegnamento rel="noreferrer"> (PEP 572) </a> (operatore <code>:=</code>), è possibile migliorare un po 'la soluzione di <a href="https://stackoverflow.com/a/1327389/9297144"> Krzysztof Krason </a> catturando il risultato della partita direttamente all'interno del caso condizione come variabile e riutilizzarlo nel corpo della condizione: </p>
<pre><code># pattern = '<title>(.*)</title>'
# text = '<title>hello</title>'
if match := re.search(pattern, text, re.IGNORECASE):
title = match.group(1)
# hello
</code></pre> </div>
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<P> <code>re.search('<title>(.*)</title>', s, re.IGNORECASE).group(1)</code> </p> </div>
</div>
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<P> I pezzi forniti di codice non affrontare <code>Exceptions</code>
Posso suggerire </p>
<pre><code>getattr(re.search(r"<title>(.*)</title>", s, re.IGNORECASE), 'groups', lambda:[u""])()[0]
</code></pre>
<P> Questo restituisce una stringa vuota per impostazione predefinita se non è stato trovato il modello, o la prima partita. </P> </div>
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<P> Prova: </p>
<pre><code>title = re.search('<title>(.*)</title>', html, re.IGNORECASE).group(1)
</code></pre> </div>
</div>
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<i class="far fa-newspaper fa-2x mb-2" style="display:block;color:gray;"></i>
</div>
<div class="col-md-12">
<P> Posso raccomandare a Beautiful Soup. Zuppa è un ottimo lib per analizzare tutto il vostro documento HTML. </P>
<pre><code>soup = BeatifulSoup(html_doc)
titleName = soup.title.name
</code></pre> </div>
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<P> Mi piacerebbe che questo dovrebbe essere sufficiente: </p>
<pre><code>#!python
import re
pattern = re.compile(r'<title>([^<]*)</title>', re.MULTILINE|re.IGNORECASE)
pattern.search(text)
</code></pre>
<P> ... supponendo che il testo (HTML) è in una variabile denominata "testo". </P>
<P> Questo presuppone anche che non ci sono altri tag HTML che possono essere legalmente incorporato all'interno di un tag HTML TITLE e non c'è modo per incorporare legalmente ogni altra <carattere all'interno di un tale contenitore / blocco. </P>
<P> <strong> Tuttavia </strong> ... </p>
<P> Non usare le espressioni regolari per l'analisi HTML in Python. Utilizzare un parser HTML! (A meno che non hai intenzione di scrivere un parser completo, che sarebbe un lavoro extra quando vari HTML, SGML e XML parser sono già nelle librerie standard. </P>
<P> Se la movimentazione "mondo reale" <strong> tag zuppa </strong> HTML (che spesso non conformi a qualsiasi validatore SGML / XML) quindi utilizzare il <a href = "https: //www.crummy. com / software / BeautifulSoup /" rel = "nofollow noreferrer"> BeautifulSoup </a> pacchetto. Non è nelle librerie standard (ancora), ma è larga consigliato per questo scopo. </P>
<P> Un'altra opzione è: <a href="http://lxml.de/" rel="nofollow noreferrer"> lxml </a> ... che è scritto adeguatamente strutturati (standard conforme) HTML. Ma ha la possibilità di fallback per utilizzare BeautifulSoup come un parser:. <a href="http://lxml.de/elementsoup.html" rel="nofollow noreferrer"> ElementSoup </a> </p> </div>
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