Slavi Pantaleev 2d436491c6 Escape mautrix-meta username prefix in registration regexes ...

The user-namespace regexes in the mautrix-meta-messenger and
mautrix-meta-instagram registration templates interpolated
the bridge username prefix without regex-escaping it, unlike the
neighboring homeserver domain and appservice username values. The
default prefixes are regex-safe, but a customized prefix containing
regex metacharacters would produce a wrong (too broad or invalid)
appservice user namespace.

Related to the registration regex discussion in #5096.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-07-13 16:34:31 +03:00

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Escape mautrix-meta username prefix in registration regexes

2026-07-13 16:34:31 +03:00