bash - xmllint to parse a html file

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bash - xmllint to parse a html file

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

bash - xmllint to parse a html file

I was trying to parse out text between specific tags on a mac in various html files. I was looking for the first <H1> heading in the body. Example:

<BODY>
<H1>Dublin</H1>

Using regular expressions for this I believe is an anti pattern so I used xmllint and xpath instead.

xmllint --nowarning --xpath '/HTML/BODY/H1[0]'

Problem is some of the HTML files contain badly formed tags. So I get errors on the lines of

 parser error : Opening and ending tag mismatch: UL line 261 and LI
</LI>

Problem is I can't just do, 2>/dev/null as then I loose those files altogether. Is there any way, I can just use an XPath expression here and just say, relax if the XML isn't perfect, just give me the value between the first H1 headings?

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1 Answer

深蓝 · Answer 1 · 2021-10-23T20:03:24+0000

Try the --html option. Otherwise, xmllint parses your document as XML which is a lot stricter than HTML. Also note that XPath indices are 1-based and that HTML tags are converted to lowercase when parsing. The command

xmllint --html --xpath '/html/body/h1[1]' - <<EOF
<BODY>
<H1>Dublin</H1>
EOF

prints

<h1>Dublin</h1>

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bash - xmllint to parse a html file

bash - xmllint to parse a html file

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