Searching strings using Regex in C#

Question

I have following string returned from an HTTP request

"keyverified=yes connected=no now=1347429501 debug=Not connected and no params";

Now i want to extract different key value combinations using regex. I have tried like

var regString = @"keyverified=([a-zA-Z0-9]+)";
        var regex = new Regex(regString, RegexOptions.Singleline);
        var match = regex.Match(str);
        foreach (Group group in match.Groups)
        {
            Console.WriteLine(group.Value);
        }

For keyverified and connected it works ok and give me respective values but when I change the regString to @"debug=([a-zA-Z0-9]+)" it only gives me the first word i.e Not. I want to extract the whole value like Not connected and no params. How would I do that?

JohnB · Accepted Answer · 2012-09-12 06:38:13Z

1

You can use a lookahead, since the items before the equals sign do not contain spaces:

@"debug=([A-Za-z0-9\s]+)(?=((\s[A-Za-z0-9])+=|$))"

answered Sep 12, 2012 at 6:38

JohnB

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Comments

Teudimundo · Accepted Answer · 2012-09-12 06:33:34Z

1

For debug you sould add the space in the regex:

@"debug=([a-zA-Z0-9\s]+)"

you can write in a more compact way as:

@"debug=([\w\s]+)"

consider that if you have some other field after debug the field name will be matched as well since you don't have a proper separator between fields.

answered Sep 12, 2012 at 6:33

Teudimundo

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1 Comment

Teudimundo Over a year ago

That's what I said in the last point. If debug is the last it works. Tim as well propose a much general solution but still it works only if the multi-word field is the last one, the problem here is in the input format.

user1678541 · Accepted Answer · 2012-09-12 06:35:12Z

0

You can try these:

http://msdn.microsoft.com/en-us/library/ms228595(v=vs.80).aspx

http://www.dotnetperls.com/regex-match

answered Sep 12, 2012 at 6:35

user1678541

Comments

Tim Pietzcker · Accepted Answer · 2012-09-12 07:13:19Z

0

Assuming that a key may not contain spaces or = signs, and that values may not contain = signs, you can do this:

Regex regexObj = new Regex(
    @"(?<key>  # Match and capture into group ""key"":
     [^\s=]+   # one or more non-space characters (also, = is not allowed)
    )          # End of group ""key""
    =          # Match =
    (?<value>  # Match and capture into group ""value"":
     [^=]+     # one or more characters except =
     (?=\s|$)  # Assert that the next character is a space or end-of-string
    )          # End of group ""value""", 
    RegexOptions.IgnorePatternWhitespace);
Match matchResult = regexObj.Match(subjectString);
while (matchResult.Success) {
    Console.WriteLine("Key: " + matchResult.Groups["key"].Value);
    Console.WriteLine("Value: " + matchResult.Groups["value"].Value);
    matchResult = matchResult.NextMatch();
}

edited Sep 12, 2012 at 7:13

answered Sep 12, 2012 at 6:34

Tim Pietzcker

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3 Comments

Tim Pietzcker Over a year ago

Did you see that the lines that do something with the matches are commented out? I don't know how you're storing the key/value pairs, so I left that part up to you.

Muhammad Adeel Zahid Over a year ago

All key/value pairs are present in the example string. Furthermore, I deleted the commented lines before testing the regex

Tim Pietzcker Over a year ago

No, you needed to uncomment them and change them so the captured values will be stored somewhere. I changed them into WriteLines, hope you understand now what I meant.

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