Regex for HTML Parsing: What Works and What to Use Instead
Understand when regex can parse HTML (simple cases) and when it breaks. Learn to extract attributes, strip tags, and when to use a DOM parser.
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Tags: developer-tools, regex, html
Regex for HTML Parsing: What Works and What to Use Instead "You can't parse HTML with regex" is one of the most repeated statements in programming, made famous by a Stack Overflow post that's become part of internet folklore. The short answer is: for certain narrow tasks, regex works fine on HTML. For general-purpose HTML parsing, use a proper parser. This article explains exactly where the line is. What Regex Cannot Do With HTML Nested Elements You cannot write a regex that reliably matches the outer and its complete contents. The approach will stop too early on nested closing tags. Regex has no concept of balanced brackets or nesting depth. Malformed HTML Real-world HTML is inconsistent. Consider: (unquoted attribute) (uppercase tags) , , (three valid forms) Comments embedded in tag…
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