fix: resolve Python 3.13 re.sub PatternError in bridge.py#383
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asheshgoplani merged 1 commit intoasheshgoplani:mainfrom Mar 26, 2026
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Python 3.13 raises `re.PatternError: bad escape \u` when using `r"\1\u2022 "` as a replacement string in `re.sub()`. In Python 3.12 and earlier this was silently accepted, but 3.13 promoted the DeprecationWarning to a hard error. Change the raw string `r"\1\u2022 "` to a regular string `"\\1\u2022 "` so that `\1` is a proper backreference and `\u2022` (bullet character) is interpreted as a Unicode literal by Python, not by the regex engine.
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Summary
re.PatternError: bad escape \u at position 2when running the conductor bridge with Python 3.13+r"\1\u2022 "to regular string"\\1\u2022 "in_markdown_to_slack()replacement patternProblem
Python 3.13 promoted the
DeprecationWarningfor invalid escape sequences inre.sub()replacement strings to a hardre.PatternError. The raw stringr"\1\u2022 "contains\uwhich is not a valid regex escape, causing the bridge to crash on every message:This prevents the Slack bridge from sending any responses back to the channel.
Fix
Replace the raw string with a regular string so that:
\\1is interpreted as the regex backreference\1\u2022is interpreted as the Unicode bullet character•by PythonTest plan
•) in Slack output