CODEWITHSUNDEEP
c#regex
Anatoly
Anatoly

Reputation: 1916

How to change regex?

private static readonly Regex FileDirectoryRegex = new Regex(@"^[^""\\:|<>*?]*\/{0,1}$");

if (folderName.EndsWith("/") || folderName.Contains("//"))
{
    throw new ArgumentException());
}

How to add last if statement validation to my FileDirectoryRegex ?

Upvotes: 1

Views: 90

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626802

You can merge the if conditions to your regex as follows:

@"^(?!.*//)[^""\\:|<>*?]*(?<!/)$"
   ^^^^^^^^              ^^^^^^

See the regex demo at RegexStorm (a little modified there since it is a multiline string demo)

The (?!.*//) is a negative lookahead that will fail the match if the engine finds // somewhere after 0+ chars other than a newline (.*) and (?<!/) is a negative lookbehind that will fail the match if there is a / right before the end of string.

HOWEVER, lots of users say it is bad practice to cram all conditions into 1 regex, please consider choosing the more readable approach (the one you have now, split the conditions).

Upvotes: 4

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