Regex Match .Net

Question

Im Using this Code with to Match

 var regex = new Regex(@"\[0-9]{3,4}/?\s?\\?\-?_?[A-Z]{2,2}-?\s?/?_?\\?[A-Z]{2,2}");

var match = regex.Match(str);
if (match.Success)
{
   Console.WriteLine(match.Value);
   Console.ReadLine();
}

this string : 1111 CD XZ and Also this one 1111/AB-XZ But is not working , im on my Intial steps on programming I just yesterday I started to use Regex. Im doing some wrong ?

My Goal Is to Match The yellow mark on this Image

Answer 1

Your regex is corrupt since the \\ before [ makes the regex engine match a literal [ symbol while you wanted to create a character class. Besides, rather than define a sequence of optional chars, you may just define a non-word optional pattern for the separators in your string.

You may use

@"\b[0-9]{3,4}(?:\W?[A-Z]{2}){2}\b"

See the regex demo

Details

• \\b - a word boundary (to make sure you really match a 3 to 4 digit sequence later)
• [0-9]{3,4} - 3 to 4 digits
• (?:\\W?[AZ]{2}){2} - 2 sequences of
  • \\W? - an optional non-word char (whitespace, punctuation or symbol)
  • [AZ]{2} - 2 uppercase ASCII letters
• \\b - a trailing word boundary.

Answer 2

使用这个正则表达式(?i)\\d{3,4}[\\s\\/]\\/?[az]{2}[-\\s][az]{2}