CODEWITHSUNDEEP
c#regex
Alexei
Alexei

Reputation: 1339

Regexp Remove any non alphanumeric, but leave some special characters in one expression

I have this code that replaces all non alphanumeric characters with "-" char.

return Regex.Replace(strIn, @"[\W|_]+", "-", RegexOptions.IgnorePatternWhitespace | RegexOptions.IgnoreCase);

but I need to change it to allow pass some special characters (one or more) for example: #,*,%

how to change this regular expression?

Upvotes: 3

Views: 3083

Answers (6)

Hakan E.
Hakan E.

Reputation: 11

It seems this way is the best solution for you 

@"(?!.*[^\w#*%])"

Upvotes: 1

Toto
Toto

Reputation: 91373

How about this one:

[^a-zA-Z0-9#*%]+

If you are using unicode you can do (as Tim's answer):

[^\p{L}\p{N}#*%]+

Upvotes: 2

Alan Moore
Alan Moore

Reputation: 75222

You can use set subtraction for that:

@"[\W_-[#*%]]+"

This matches the set of all non-word characters and the underscore, minus the set of #, * and %.

Note that you don't have to use | for "or" in a character class, since that's implied. In fact, the | in your regex just matches |.

Note also that in .NET, \w matches a few other "connector punctuation" characters besides the underscore. If you want to match the other characters too, you can use 

@"[\W\p{Pc}-[#*%]]+"

Upvotes: 0

Tim Pietzcker
Tim Pietzcker

Reputation: 336098

Use

[^\p{L}\p{N}#*%]+

This matches one or more characters that are neither letters nor digits nor any of #, * or %.

Upvotes: 4

Jamiec
Jamiec

Reputation: 136074

Another option, you can use charcter class subtractioninfo, for example to remove # from the character class:

[\W_-[#]]+

Just add other accepted special chars after the #. Live example here: http://rextester.com/rundotnet?code=YFQ40277

Upvotes: 2

Joey
Joey

Reputation: 1790

Use this.

([^\w#*%]|_)

Add any other special characters after the %.

It is basically saying, match any character that is not (^) a word character(\w), #, * or % OR match _.

Upvotes: 1

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