Re: dir match, dir may or may not appear

What syntax error and where? Perl is usually quite informative with its error messages.

Most likely, it's a syntax error in your regular expression. See perlre, especially about quantifiers.

Personally, I would reformulate the problem as "any directory that starts with /usr/ and ends with /bin, and do the checking in two regular expressions instead.

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Re^2: dir match, dir may or may not appear by hellosarathy (Novice) on Jan 12, 2016 at 09:13 UTC
the regexp has errors: `Nested quantifiers in regex marked by <-- HERE in m/^/usr/(/[^/]+{ <- +- HERE 0,1})/bin//` [download] Two expressions is fine,is there a one liner, as this could increase in future...?	[reply] [d/l]
Re^3: dir match, dir may or may not appear by Corion (Patriarch) on Jan 12, 2016 at 09:18 UTC
Yes, see perlre. If one expression is too difficult, why not use two? If you really need to write it in one expression, use a group and quantify that: `m!^/usr(?:/[^/]+)?/bin!;` [download]	[reply] [d/l]
Re^3: dir match, dir may or may not appear by Anonymous Monk on Jan 12, 2016 at 09:20 UTC
a quantifier is + a quantifier is {0,1} You can't have {0,1}{0,1}{0,1}{0,1} You can't have +{0,1}+{0,1} If you want a pattern (`[^/]+`) to repeat, you have to group it perlre, perlretut, perlrequick describe these words I've used, go fish	[reply] [d/l]