You are using literal spaces to match literal spaces. Adding/removing a single extra space will destroy the match, as will the presence of extra parentheses These are a few of the things that break your regex: 

(KONAMI ORIGINAL) END OF THE CENTURY <BASIC>  / NO.9
(KONAMI ORIGINAL) END OF THE CENTURY <BASIC>/ NO.9
(KONAMI ORIGINAL) END OF THE CENTURY<BASIC> / NO.9
(KONAMI ORIGINAL)END OF THE CENTURY <BASIC> / NO.9
(KONAMI ORIGINAL (no 9) ) END OF THE CENTURY <BASIC> / NO.9

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using \s+ where one or more spaces is likely and \s* where 0 or more are OK is better if humans are involved in the typing!

doc

In reply to Re: Break my regex, please by doc
in thread Break my regex, please by patgas

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