The "?" quantifier means to match 0 or 1 times as specified in the "Quantifiers" section of perlre. Therefore your pattern to match this could be simply (/[^/]+)? which is similar to QuillMeantTen's approach above.

In reply to Re^3: dir match, dir may or may not appear by hippo
in thread dir match, dir may or may not appear by hellosarathy

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