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Showing content from https://github.com/jrblevin/markdown-mode/issues/524 below:

GFM mode italics fontification incorrect for single characters · Issue #524 · jrblevin/markdown-mode · GitHub

Expected Behavior

This issue is related to #448, which modified fontification in GFM mode such that underscores (_) within tokens did not fontify while asterisks (*) did, i.e. such that

were fontified or not as suggested by their text. Further, asterisks and underscores at edges of words should continue to function as expected, such that each of

are emphasized.

Actual Behavior

The new detection regex seems to be missing the latter two cases, i.e. *a* and _b_ are not getting emphasized. Worse, the leading asterisk or underscore is available to match a later trailing such symbol, such that the entire string

is emphasized, when only the first and last token should be.

Software Versions

markdown-mode version 2.5-dev (installed via MELPA)
GNU Emacs 26.3 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.14) of 2020-03-26, modified by Debian
Ubuntu 20.04.1 LTS


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