The problem is your validate function RSP_options_validate(). This function always a empty string. Check your conditional statement with preg_match.
If you test your source without this functions, it works.
register_setting( 'RSP_options_group', 'RSP_options', 'RSP_options_validate' );
to
register_setting( 'RSP_options_group', 'RSP_options' );
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