Spurious error report in regex when "treat phpdoc types as certain" is set to false #14904

Bug report

phpstan is complaining about an Unreachable statement, but clearly the statement is reachable.

Code snippet that reproduces the problem

https://phpstan.org/r/03c27c89-3d04-4353-9738-cb6d91c0413b

Expected output

No errors

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