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Version

1.9.1

Description

If a user's name includes square brackets, the password will not be encrypted and a preg_replace error is reported.

Expectation

The password to be encrypted without any issue.

Reproduction steps

Add

$yourls_user_passwords = array(
    'testuser[2]' => 'password',
);

Context

Seems like the bracket might be breaking something for the preg_replace pattern.

I only tried curly braces as an additional test, which did work, but even just 1 square bracket breaks the encryption.