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<?php $sanitized = '?my CSS+cl@ss#'; $sanitized = preg_replace( '/[^A-Za-z0-9_-@]/', '', $sanitized ); var_dump( $sanitized );
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace(): Compilation failed: range out of order in character class at offset 13 in /in/lqOOu on line 3 NULL

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