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RegEx help determining value of select box (html)

Posted on 2012-09-16
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Last Modified: 2012-09-21
Hey everyone,

I'm having trouble wrapping my head around this. I'm trying to parse through some html and get the selected value for a select box with the name of "status"

This is the select box code:

           <select name="status">
                <option value="1" >online</option>
                <option value="0" selected>offline</option>
               <option value="-1" >deleted</option>
            </select>

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Essentially, what I'm trying to get together is a function that will return the value of the selected item.

For example: sValue = GetSelectedItemFromSelectBox("status");

This would return: "0"

Can someone here give me a hand with this?
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Question by:mcainc
2 Comments
 
LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 2000 total points
ID: 38406618
Try the following:

static string GetSelectedItemFromSelectBox(string input, string elementNameAttributeValue)
{
    string select_pattern = "(?is)<select [^>]*name=[\"']?" + elementNameAttributeValue + "['\"]?.*?</select>";
    string value_pattern = "(?i)(?<=(?:[^<]*|<(?!select )))<option (?=[^>]*value=[\"']?([^ '\">]*))[^>]*selected";

    Match m = Regex.Match(input, select_pattern);

    if (m.Success)
    {
        m = Regex.Match(m.Value, value_pattern);

        if (m.Success)
        {
            return m.Groups[1].Value;
        }
    }

    return "";
}

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Author Closing Comment

by:mcainc
ID: 38421095
Wow, this worked perfectly! Thank you!
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