Regex doesn't match in C#

Question

I have an ASP.net string, and I am trying to extract ID from it. Here is the code:

public static string getName(string line)
{
    string ret = "";

    if (!line.Contains("ID="))
        return ret;
    var regex = new Regex("/.*ID=\".*?\".*/g");
    if (regex.IsMatch(line))
        ret = regex.Match(line).Groups[1].Value;
    return ret;
}

And regex.IsMatch(line) always returns false.

Perhaps you could add an example were the regex is not working ? — Mikescher
– Mikescher, Commented Feb 14, 2014 at 11:58
For example, this line : <asp:Label ID="lbl_QV4" runat="server" Text="→ QV5"></asp:Label> — ibnLoki
– ibnLoki, Commented Feb 14, 2014 at 12:01

Sabuj Hassan · Accepted Answer · 2014-02-14 12:30:12Z

7

You didn't do the grouping at your regex. Here it is

var regex = new Regex("/.*ID=\"(.*?)\".*/g");
                               ^   ^

Update: The way you are matching the regex is not correct. Here is how it works.

var regex = "ID=\"(.*?)\"";
if ( Regex.IsMatch(line, regex) ){
    ret = Regex.Match(line, regex).Groups[1].Value;
}

edited Feb 14, 2014 at 12:30

answered Feb 14, 2014 at 11:58

Sabuj Hassan

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Comments

ibnLoki · Accepted Answer · 2014-02-14 15:24:05Z

0

Solved it. Workiing code is :

public static string getName(string line)
        {
            string ret = "";

            if (!line.Contains("ID="))
                return ret;
            var regex = ".*ID=\"(.*?)\".*";
            if (Regex.IsMatch(line, regex) )
                ret = Regex.Match(line, regex).Groups[1].Value;
            return ret;
        }

answered Feb 14, 2014 at 15:24

ibnLoki

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