Fix crash when disable command is preceded by unicode character

[SimplyDanny]

Fixes #5945.

[SwiftLintBot]

	18 Messages
📖	Building this branch resulted in a binary size of 29603.41 KiB vs 29602.9 KiB when built on main (0% larger).
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📖	Linting Nimble with this PR took 0.78 s vs 0.78 s on main (0% slower).
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