Question about C# regex?

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Hi guys, i need to make a pattern, this is my first program where i use this regex thing and I'am not much familiar with it, basically i need to allow the string to have space ot better " ", but if i put that in the pattern, for the regex, that means, it must have a whitespace, so how to make, for regex to dont care if there is a whitespace or not?
and i also need to allow "/" and "\",

so how to allow " ", "/" and "\" in the string for the regex basically to skip them?
i hope you understand me. for more info ask me. tnx in advance.

btw \s means must have whitespace :/ which is not useful for me.

Posted 9-Jan-15 5:24am

SrgjanX

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3 solutions

Solution 1

Depends on what you are trying to do - and it isn't clear from your description.
To match your "whitespace" collection is easy:

[\s\\/]

will match any character which is any one of them, and

[^\s\\/]

will match any character which is none of them.

But there isn't a code which says "ignore these characters, regardless of where they are in the string" - for that kind of thing, you are better off using string.Replace in C# to remove them before passing the data to a Regex for matching.

And if you are going to work with regexes, then get a copy of Expresso [^] - it's free, and it examines and generates Regular expressions. I use it a lot!

Posted 9-Jan-15 5:29am

OriginalGriff

Solution 3

The others have already answered your specific question, but I wanted to point out a couple sites that will help you to learn RegEx.
A very helpful site is regexlib[^]; they have a large library of Regular Expressions. They also have a RegEx tester[^], which is very useful when trying to see what your reg ex actually does. Also a very useful RegEx tool is available here[^].

Posted 14-Jan-15 2:58am

BillW33

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SrgjanX 14-Jan-15 20:20pm

Thanks

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Thomas Daniels · Accepted Answer · 2015-01-09T05:30:00

Solution 2

Try this:

C#

string input = "This is an input string with spaces.";
if (Regex.IsMatch(input, @"[ /\\]"))
{
    // string contains a space, a slash, or a backslash or a mix of them
}
else
{
    // string does not contain any of those chars
}

Posted 9-Jan-15 5:30am

Thomas Daniels

Comments

SrgjanX 9-Jan-15 11:34am

thank both of you, replaced the pattern and works now :) tnx for the quick answers.

Thomas Daniels 9-Jan-15 11:36am

You're welcome!