Need Regex match pattern(in either C# or VB.NET)

Question

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I have a string which i need to parse using Regex class of Syste.Text.Regularexpressions.
I need to find if the first 2 characters of the string are either "00" or "07" or "16" or "23".
Please let me know as what the pattern would be to match the above.

thanks to all who helped and also who viewed my query.

Posted 3-Mar-11 14:57pm

ssircar1971

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3 solutions

Solution 1

^(00|07|16|23)

Was that really so hard to read the reference? (Such as http://www.regular-expressions.info/reference.html[^])

[EDIT] The pattern was corrected later as I forgot the criterion "first 2 characters".
Bryian Tan, thank you for correct Answer.

—SA

Posted 3-Mar-11 15:03pm

Sergey Alexandrovich Kryukov

Updated 3-Mar-11 16:50pm

v5

Solution 3

If you don't know REGEX, you may not use it for such simple tasks.
Try instead this clearer approach:

private static bool TestString(string s)
{
    if (s.Length < 2) return false;
    switch (s.Remove(2))
    {
        case "00":
        case "07":
        case "16":
        case "23": return true;
        default: return false;
    }
}

Not everything should be done with regexes!

Posted 4-Mar-11 3:39am

Toli Cuturicu

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Bryian Tan · Accepted Answer · 2011-03-03T15:49:00

Solution 2

hello,

You can try something like this. Please refer to SAKryukov post to read the reference.

C#

string regMatch = @"^(00|07|16|23)";
       if (System.Text.RegularExpressions.Regex.IsMatch("00test", regMatch))
       {
           Response.Write( "valid");
       }
       else
       {
           Response.Write( "invalid!");
       }

Posted 3-Mar-11 15:49pm

Bryian Tan

Comments

Sergey Alexandrovich Kryukov 3-Mar-11 22:47pm

I forgot the criteria "first two characters", so your answer is correct, my 5, and mine needs a fix.
--SA

Bryian Tan 4-Mar-11 20:30pm

hi SAKryukov, Thanks :)