Question

Can anyone help me make a regex or give me a good solution that can split/check the following string:

“<2342Flsdn3Z><9124Fsflj20>”

Everything starts with a “<” and the 6 caracter is a “F” and the string ends with a “>”
Is it possible to make a Regex that can find “strings” like this?

Answer 1

How about this: <.{4}F[^>]+>

It matches the opening <, followed by any 4 chars, F, then anything till the closing > (by matching anything that is not a >).

string input = "<2342Flsdn3Z><9124Fsflj20>";
string pattern = "<.{4}F[^>]+>";
foreach (Match m in Regex.Matches(input, pattern))
{
    Console.WriteLine(m.Value);
}

EDIT: part of making a good regex is clearly specifying the pattern you want to match. For example, the way you worded the question leaves certain details out. I responded with my pattern to match any character as long as F was where you specified.

For a better regex you could’ve told us a number of things:

• Chars before F will always be digits and of length 4: \d{4} or [0-9]{4}
• Chars after F will be of X length (6?) and can only be numbers and letters: [\dA-Z]{6}
• Case is insensitive: use RegexOptions.IgnoreCase (.NET) or use [a-zA-Z]
• State your intention: are you matching it? Trying to extract the inner value? What do you mean by split? Split on what?
• Specify the language you’re using: C#, Python, Perl, etc. (you did this one)