CODEWITHSUNDEEP
c#regexvalidationpath
L.Cam
L.Cam

Reputation: 33

Regex for directory path format validation

I'm trying to build a regex to validate directory path but I can't found a good way to do that. Could someone help me? examples :

/test/ -> could match
/test/toto/tata -> could match

\test\ -> could match
\test\toto\tata -> could match

//test/ -> could not match
\\test\ -> could not match
/test//toto -> could not match
/test\tata -> could not match

EDIT : i try this regex but it doesn't match all cases.

^(\/{0,1}(?!\/))[A-Za-z0-9\/\-_]+(\.([a-zA-Z]+))*$

Upvotes: 0

Views: 555

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626690

It looks like you want to make sure there is at least one char in between the directory delimiters, the string can only start with a single directory delimiter and can optionally end with a directory delimiter.

As the string.Concat(System.IO.Path.GetInvalidPathChars()) (reference) returns "\"<>|\0\u0001\u0002\u0003\u0004\u0005\u0006\a\b\t\n\v\f\r\u000e\u000f\u0010\u0011\u0012\u0013\u0014\u0015\u0016\u0017\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f", you can actually put the [^"<>|\u0000-\u001f]+ in the regex to match subfolder names and use

var pattern = @"^(?=([/\\]))(?:\1[^\\/""<>|\u0000-\u001f]+)+\1?$";

See the regex demo.

Details:

  • ^ - start of string
  • (?=([/\\])) - next char must be a / or \ directory separator char (captured into \1)
  • (?:\1[^\\/""<>|\u0000-\u001f]+)+ - one or more repetitions of a directory separator char followed with one or more occurrences of valid path and directory separator chars, i.e. any chars other than \, /, ", <, >, | and the control ASCII chars
  • \1? - an optional directory separator char captured into Group 1
  • $ - end of string.

Upvotes: 1

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