[rahul05ranjan]

With the link-patterns extra enabled, a pattern matching inside an inline HTML markup token got replaced there — inserting an anchor into an attribute value and destroying <word@example.com> auto-links:

>>> lp = [(re.compile(r"\b(word)\b"), r"/w/\1")]
>>> markdown2.markdown('See <span title="word">x</span>', extras=["link-patterns"], link_patterns=lp)
<p>See <span title="<a href="/w/word">word</a>">x</span></p>           # invalid HTML
>>> markdown2.markdown('<word@example.com>', extras=["link-patterns"], link_patterns=lp)
<p>&lt;<a href="/w/word">word</a>@example.com></p>                     # mailto auto-link destroyed

LinkPatterns.run excluded matches inside markdown link syntax and <http://…> auto-links (issues #385/#446 covered those), but not the other inline tokens markdown2's own tokenizer (_sorta_html_tokenize_re) classifies as markup: tags, comments, processing instructions, and <word@example.com> style auto-links — which _do_auto_links processes after the extra runs, so the match split the token before the auto-linker ever saw it.

This excludes matches that fall inside a _sorta_html_tokenize_re token. Prose still linkifies; matches inside an element's content still linkify; markup and auto-links are left intact for the later stages:

<p>See <span title="word"><a href="/w/word">word</a></span> here.</p>
<p><a href="mailto:word@example.com">word@example.com</a></p>
<p><img src="/x.png" alt="word"></p>
<p>A <a href="/w/word">word</a> in prose.</p>

Fixes #752.

Verification (system Python 3.13):

• New test test/tm-cases/link_patterns_in_html_tags_issue752.{text,html,opts} covering all three symptoms plus prose/element-content controls: fails on master@6d0a518 with the exact attribute-corruption diff, passes with this change.
• Full suite via test/test.py: exit 0, no failures (pygments present, wavedrom/latex2mathml/emoji cases skipped as unavailable).
• Email auto-link output verified identical to the no-extra rendering after the harness's standard email-obfuscation normalization (which the tm-case comparison applies).