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Disallow whitespace in footnote identifiers #431

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Merged
lepture merged 1 commit into from
Feb 22, 2026
+4 −3
Merged

Disallow whitespace in footnote identifiers #431

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7 changes: 4 additions & 3 deletions src/mistune/plugins/footnotes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,6 @@
from typing import TYPE_CHECKING, Any, Dict, List, Match, Union

from ..core import BlockState
from ..helpers import LINK_LABEL
from ..util import unikey

if TYPE_CHECKING:
Expand All @@ -14,16 +13,18 @@
__all__ = ["footnotes"]

_PARAGRAPH_SPLIT = re.compile(r"\n{2,}")
# Like LINK_LABEL but disallows whitespace in footnote identifiers
# https://michelf.ca/projects/php-markdown/extra/#footnotes
_FOOTNOTE_LABEL = r"(?:[^\\\[\]\s]|\\.){1,500}"
REF_FOOTNOTE = (
r"^(?P<footnote_lead> {0,4})"
r"\[\^(?P<footnote_key>" + LINK_LABEL + r")]:[ \t\n]"
r"\[\^(?P<footnote_key>" + _FOOTNOTE_LABEL + r")]:[ \t\n]"
r"(?P<footnote_text>[^\n]*(?:\n+|$)"
r"(?:(?P=footnote_lead) {1,4}(?! )[^\n]*\n+)*"
r")"
)

INLINE_FOOTNOTE = r"\[\^(?P<footnote_key>" + LINK_LABEL + r")\]"
INLINE_FOOTNOTE = r"\[\^(?P<footnote_key>" + _FOOTNOTE_LABEL + r")\]"


def parse_inline_footnote(inline: "InlineParser", m: Match[str], state: "InlineState") -> int:
Expand Down