Regular Expressions 101

Community Patterns

Invalid HTML syntax regex


Regular Expression
PCRE2 (PHP >=7.3)

</?[^\0- !-@[-`{-\x7f][^\0- !-,:-@[-`{-\x7f]*+(?!>)


A bare demo of detecting syntactically invalid HTML, created for jridgewell/proposal-regexp-atomic-and-possessive#1.

It's a proposal for the + quantifier modifier for ECMAScript regular expressions.

Currently only properly detects invalid ending tags, and is only about having the correct syntax.

Submitted by Keyacom - 2 years ago (Last modified 2 years ago)