I need a regex that can match either <head ...> or <head> but not <header>.
I currently have (<head(?!:er)*>
I succeeded in part, removing er with (?!:er) but <head ...> is still invalid.
Any regex expert could help? Thanks!
Regex match <head ...> not <header>
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1 Answers
Your current <head(?!:er)*> pattern matches <head, then it optionally requires (due to * at the end of the lookahead construct) if the text immediately to the right is not :er (here, : is part of the lookahead pattern, not part of a lookahead construct) and then requires a > char. Since > is not :, this lookahead always returns true.
You need something like
<head(?!er>)[^<>]*>
where
<head- matches<head(?!er>)- makes sure the text immediately on the right is noter>[^<>]*>- matches any zero or more chars other than<and>and then a>.
See the regex demo.
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