Regex to check a string

Question

I'm trying to check a string and then extract all the variables which starts with @. I can't find the appropriate regular expression to check the string. The string may start with @ or " and if it's started with " it should have a matching pair ".

Example 1:

"ip : "+@value1+"."+@value2+"."+@value3+"."+@value4

Example 2:

@nameParameter "@yahoo.com"

Thanks

this is kind of unclear - what are you trying to extract? for each of your examples, you should list what you want in your results array. — Igor Serebryany
– Igor Serebryany, Commented Oct 6, 2009 at 13:20
I think he wants all the @'s except when inside a quoted string. — Adam Luter
– Adam Luter, Commented Oct 6, 2009 at 13:23
Whenever you start looking for "matching pairs", you might want to starting thinking about something other than a regex. Not that it will be impossible to make the expression work; just that it will likely end up as more trouble than it's worth. — Joel Coehoorn
– Joel Coehoorn, Commented Oct 6, 2009 at 13:28
yes Adam is right those after @'s are my parameters and those in double quote (") pairs are the fixed values . — Asha
– Asha, Commented Oct 6, 2009 at 13:54

Adam Luter · Accepted Answer · 2009-10-06 13:27:40Z

1

It would probably be easiest to first split the string on each quoted string, then check the unquoted parts for @'s. For example all quoted strings could be: /"[^"]*"/, calling Regex.Split on your string would return an array of strings of the non-quoted parts, which you could then use the expression /@\w+/ to find any @'s.

answered Oct 6, 2009 at 13:27

Adam Luter

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2 Comments

Asha Over a year ago

I tried to split the string with /"[^"]*"/ but it didn't work !!! System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex(@"/""[^""]*/"""); string[] consts = reg.Split(valueToCheck);

Asha Over a year ago

that was a syntax error I should have changed something .but thank you about the split suggestion .

Rubens Farias · Accepted Answer · 2009-10-06 13:32:47Z

0

Try this:


string text = "@nameParameter \"@yahoo.com\"";
Regex variables = new Regex(@"(?<!"")@\w+", RegexOptions.Compiled);
foreach (Match match in variables.Matches(text))
{
    Console.WriteLine(match.Value);
}

answered Oct 6, 2009 at 13:32

Rubens Farias

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Comments

user184968 · Accepted Answer · 2009-10-07 07:08:38Z

0

To check the strings you have provided in your post:

(^("[^"\r\n]"\s+@[\w.]+\s*+?)+)|(((^@[\w.]+)|("@[\w.]+"))\s*)+

answered Oct 7, 2009 at 7:08

user184968

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