Regex: How to match a string contains any of the particular set of words

Hi,

I need to make a regex where I need to match whether a string contains any of the particular set of words. For example:

I have a test string I need to check whether this string contains any of these words "c#,sql,vb,java"

Please help me.

Take a look at the following example which I've prepared for you:

        Sentence
        <asp:TextBox ID="TextBox1" runat="server" Width="467px"></asp:TextBox>
        <br />
        Words   
        <asp:TextBox ID="TextBox2" runat="server" Width="467px"></asp:TextBox>
        <br />
        <br />
        <asp:Button ID="btnFindWords" runat="server" onclick="btnFindWords_Click" 
            Text="REGEX FIND" />
        <br />
     <asp:Label ID="lblFound" runat="server"></asp:Label>

code-behind

        protected void btnFindWords_Click(object sender, EventArgs e)
        {
            string sentence = TextBox1.Text;
            string words = TextBox2.Text;
            string constructRegex = String.Empty;

            constructRegex += "|";
            foreach (string word in words.Split(','))
            {
                constructRegex += word + "|";
            }

            Regex expr = new Regex("\b"+constructRegex+"\b", RegexOptions.IgnoreCase);
            foreach (Match m in expr.Matches(sentence))
            {
                lblFound.Text += m.Value + " ";
            }
        }

Im creating regEx dynamically. Basically the regEx to find words in a sentence is: \b|word1|word2|word3|\b

Hope this helps,
Hajan

This will serve you : (c#|sql|vb|java)

Try this sample:

#region Using Directives

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Linq.Expressions;
using System.Collections;
using System.Text.RegularExpressions;

#endregion

public class Example
{

    public static void Main()
    {
        const string inputString = "I have c#";
        var regex = new Regex(@"(c#|sql|vb|java)", RegexOptions.Singleline | RegexOptions.IgnoreCase);


        Console.WriteLine(regex.IsMatch(inputString) 
            ? "Matched" : "Not matched");

        const string inputString2 = "I have php";
        Console.WriteLine(regex.IsMatch(inputString2)
            ? "Matched" : "Not matched");


        const string inputString3 = "I have sql vb";
        Console.WriteLine(regex.IsMatch(inputString3)
            ? "Matched" : "Not matched");

        Console.ReadLine();
    }

}

Output:

Matched

Not matched

Matched